test(branch): clean up rejected-create UIDs too

Refs: DX-31564

Co-authored-by: Raj Pandey <raj.pandey@contentstack.com>
Co-authored-by: Reeshika Hosmani <reeshika.hosmani@contentstack.com>
Co-authored-by: Aniket Shikhare <aniket.shikhare@contentstack.com>
Co-authored-by: Claude <noreply@anthropic.com>

Author: 4 people

src/test/java/com/contentstack/cms/stack/BranchAPITest.java

@@ -113,6 +113,7 @@ void createWithEmptyListClonesNoEnvironments() throws Exception {
     void createWithUnknownNameIsRejectedAndCreatesNoBranch() throws Exception {
         Response<ResponseBody> response = stack.branch()
                 .create(body(UID_UNKNOWN, Collections.singletonList(UNKNOWN_ENV))).execute();
+        CREATED.add(UID_UNKNOWN);
         assertEquals(422, response.code(), "an unknown environment name should give the API's 422");
         assertNotNull(response.errorBody(), "the API's error body should be present");
         assertTrue(response.errorBody().string().contains("publish_config.environments"),
@@ -127,6 +128,7 @@ void createWithUnknownNameIsRejectedAndCreatesNoBranch() throws Exception {
     void createWithMixedNamesIsRejectedAndCreatesNoBranch() throws Exception {
         Response<ResponseBody> response = stack.branch()
                 .create(body(UID_MIXED, Arrays.asList(ENV_DEVELOPMENT, UNKNOWN_ENV))).execute();
+        CREATED.add(UID_MIXED);
         assertEquals(422, response.code(), "a mix with an unknown name should give the API's 422");
         assertNotNull(response.errorBody(), "the API's error body should be present");
         assertTrue(response.errorBody().string().contains("publish_config.environments"),