build: AGP 9.4.1 and Gradle 9.6.0

[edusperoni]

Migrates the build to what current Android Studio uses: AGP 9.4.1 + Gradle 9.6.0, with no opt-out flags (android.newDsl, android.builtInKotlin stay at their AGP 9 defaults). Targeted at the 9.2 release. Draft because several items below change what every NativeScript app build sees and need a maintainer decision.

The full device suite passes on an API 36 arm64 emulator (runtestsAndVerifyResults -Pabis=arm64-v8a: 1248 passed, 0 failed), the CI Build job's root ./gradlew builds all four ABIs, runSbgTests passes, and --warning-mode all reports 0 Gradle deprecations from this repo and 0 D8 Kotlin-metadata warnings (AGP 9.4.1 bundles R8 9.4.24, so the R8 pin from #2050 is gone).

Commits

1. Gradle 9.6.0 wrappers and AGP 9.4.1. test-app and root wrappers regenerated. SDK Build Tools to 36.0.0 (AGP 9.4 minimum); compileSdk stays 35 since it drives the metadata generator and therefore the API surface every app sees. Removed the com.android.tools:r8 pin (NS_DEFAULT_R8_VERSION / -Pr8Version, only ever shipped in today's dev builds) and the groovy-all classpath entry (a Gradle 7 workaround; Gradle 9 bundles Groovy 4). BuildToolTask is now abstract, since Gradle 9 made JavaExec's injected services abstract.
2. Built-in Kotlin and the androidComponents variant API in app/build.gradle. kotlin-android and kotlinOptions are gone (kotlin-parcelize stays and works). onVariants for the selected build type captures the compile classpath and SingleArtifact.ASSETS; the compile classpath is also an input of cleanupAllJars, because AGP 9 builds the compile-time R.jar in generate<Variant>RFile and the build otherwise fails on an implicit dependency. The 19 per-task findByName blocks on buildMetadata are one lazy dependsOn. SDK directory comes from sdkComponents.sdkDirectory; the platform name is built from compileSdk/compileSdkMinor/compileSdkPreview. Task.project reads at execution time are gone. validateAppIdMatch referenced an undefined appIdentifier, so it threw instead of warning whenever app.gradle overrode applicationId; fixed. In runtime/build.gradle: proguard-android.txt → proguard-android-optimize.txt (AGP 9 rejects the old file; minify is off, output unchanged), library targetSdkVersion → testOptions/lint targetSdk, and createPackageConfigFileTask deleted (it hooked bundleDebug/bundleRelease, which don't exist on a library, and used the removed Project.exec).
3. Gradle 10 deprecations. Gradle 9 deprecates implicit lookup of a parent project's extra properties, which the app script used ~25 times (outLogger, nativescriptDependencies, additional_gradle.properties values, ...) and plugin include.gradle files use too. The root's allprojects.beforeEvaluate now copies the root extra properties into each subproject, the same way userDefinedGradleProperties already was, skipping -P names so they keep precedence. Multi-string dependency notation converted; kotlinOptions → compilerOptions in the metadata generator.
4. -b is removed in Gradle 9. test-app/runtests.gradle moved to test-app/runtests/ with its own settings.gradle, run with -p runtests; its Exec tasks keep test-app as the working directory. The ccache probe uses providers.exec (under Gradle 9 the old Project.exec call was silently caught and printed "CCache not found!" on every build).
5. Jetifier no longer enabled. AGP 9 warns it is deprecated, defaults it to false, and removes it in AGP 10. See open question 2.
6. CI: test jobs enable org.gradle.caching like the build job. The comment that justified disabling it described the old -b nested builds. Verified locally, not yet on CI.
7. Root getPackageVersion/getCommitVersion read their -P properties at configuration time instead of via Task.project in doLast.
8. Metadata for Kotlin classes (found by the device tests). With built-in Kotlin, AGP writes Kotlin classes to intermediates/built_in_kotlinc/<buildType>/<task>/classes, not tmp/kotlin-classes. buildMetadata now scans both, otherwise Kotlin classes are missing from the metadata (31 Kotlin specs failed). This affects every app with Kotlin code.

Open questions (shipped-behavior decisions)

1. android.dependency.useConstraints (most important). AGP 9 defaults it to false, so compile-classpath versions are no longer aligned with runtime-classpath versions. In the test app the compile classpath now resolves core-ktx 1.2.0 / core-runtime 2.1.0 while the runtime ships 1.13.0 / 2.2.0 (AGP 8 aligned both). Metadata and SBG jars are built from the compile classpath, so apps can get metadata for older API versions than they ship. Options: set android.dependency.useConstraints=true in the shipped gradle.properties (AGP 8 behavior, slower configuration) or accept the drift. Left at the AGP default here.
2. Jetifier. Apps that still depend on support-library artifacts break. Setting it in App_Resources/Android/gradle.properties does not re-enable it (those become extra properties, which AGP never reads); only -P, ~/.gradle/gradle.properties or a CLI change would. Revert commit 5 if that is too aggressive before AGP 10.
3. Plugin include.gradle / user app.gradle compatibility. Anything using apply plugin: 'kotlin-android', kotlinOptions {}, android.applicationVariants/libraryVariants/variantFilter or android.sdkDirectory now fails. android.newDsl=false / android.builtInKotlin=false restore those until AGP 10, but they are Gradle properties, so an escape hatch would have to be written by the CLI into the generated platforms/android/gradle.properties.
4. App R class is no longer final (android.enableAppCompileTimeRClass default true). User Java in App_Resources/Android/src that does switch on R.id.* stops compiling. Default kept.
5. Other AGP 9 defaults kept, none broke the build: uniquePackageNames, defaultTargetSdkToCompileSdkIfUnset (the script always sets targetSdk), onlyEnableUnitTestForTheTestedBuildType, proguard.failOnMissingFiles, r8.strictFullModeForKeepRules, r8.optimizedResourceShrinking (only matter with minify/shrinking on), proguardAndroidTxt.disallowed (the shipped app script references no proguard file).
6. getMergedAssetsOutputPath now throws a clear error when no variant of the selected build type exists, instead of falling back to an AGP 3.5 path that no longer exists.

Not done

• dts-generator's own wrapper stays at 8.9 (CI builds it through test-app's wrapper). Its one Gradle 10 deprecation is fixed upstream in android-dts-generator 5fcf611, which the submodule now points at.
• Configuration 'debugCompileClasspath' was resolved during configuration time is an AGP performance warning from the per-jar extraction tasks being created at configuration time (existing design); fixing it means one extraction task at execution time.
• The revertVersionFile hook matches task names containing Strip, while AGP's task is stripReleaseDebugSymbols (lowercase), so the root build leaves runtime/src/main/cpp/Version.h modified. Not checked whether main behaves the same.

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