feat: improve CI recovery and add availability and workload commands

[panva]

• Check Jenkins' Resume build action before scanning failures or attempting a resume. If unavailable, follow recorded resume ancestry to the nearest eligible build for the same PR and approved commit, checking failures from every visited run.
• Keep --check-for-duplicates blocking duplicate runs for the same approved commit. Suggest resume-ci or ncu-ci resume when a resume action is available, and provide manual recovery guidance otherwise.
• Add ncu-ci available to check whether Jenkins is quieting down and whether node-test-pull-request is enabled and buildable.
• Add ncu-ci workload to print the number of running and queued PR jobs, including builds waiting for downstream tests, without double-counting requests moving between the queue and executors.
• Print the matching failure excerpt and console URL when changed files prevent a resume, with bounded output for large diagnostics.
• Exclude propagated make exit summaries from file attribution while retaining direct Makefile diagnostics and failures in changed tests.

The two additions are aimed at allowing node's auto-start-ci to skip piling on more jobs and exiting gracefully before touching labels if CI is unavailable.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.12%. Comparing base (b431f15) to head (2c640e7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1204      +/-   ##
==========================================
+ Coverage   61.80%   63.12%   +1.31%     
==========================================
  Files          61       65       +4     
  Lines       11880    12257     +377     
==========================================
+ Hits         7343     7737     +394     
+ Misses       4537     4520      -17     

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[aduh95]

• Allow --check-for-duplicates to start fresh CI when a completed failed or aborted run has no usable resume path. Resume lookup errors still block duplicates.

I'm not sure we want to do that, it's probably a better idea to defer to manual action in this case as it indicates that something went wrong (I'd expect that in most cases, manual action in question would be to rebase the PR, as that likely indicates that the change is too old)

[panva]

@aduh95 reverted.

[panva]

Print the matching failure excerpt and console URL when changed files prevent a resume, with bounded output for large diagnostics.

This is what that comment in https://redirect.github.com/nodejs/node/pull/65879 would like now.

Failed to resume CI

   ✖  test/parallel/test-inspector-dom-storage-malformed.js
   ℹ  https://ci.nodejs.org/job/node-test-binary-windows-js-suites/RUN_SUBSET=3,nodes=win11-arm64-COMPILED_BY-vs2022_clang-arm64/43507/consoleText
✖  Refusing to resume CI: failures reference files changed by this PR

Full Auto Start CI output

[Earlier progress output omitted]

   ✖  test/parallel/test-inspector-dom-storage-malformed.js
   ℹ  https://ci.nodejs.org/job/node-test-binary-windows-js-suites/RUN_SUBSET=3,nodes=win11-arm64-COMPILED_BY-vs2022_clang-arm64/43507/consoleText
not ok 731 parallel/test-inspector-dom-storage-malformed
  ---
  duration_ms: 464.00300
  severity: fail
  exitcode: 1
  stack: |-
    [Routine debugger output omitted]

    [err] child process crashed, signal SIGTERM
    AssertionError [ERR_ASSERTION]: Expected values to be strictly deep-equal:
    + actual - expected

      Comparison {
    +   message: 'Could not read DOM storage items: storage is unavailable'
    -   message: 'Could not read DOM storage items: the backing file is malformed'
      }

        at process.processTicksAndRejections (node:internal/process/task_queues:104:5)
        at async d:\workspace\node-test-binary-windows-js-suites\node\test\parallel\test-inspector-dom-storage-malformed.js:74:3 {
      generatedMessage: true,
      code: 'ERR_ASSERTION',
      actual: [Object],
      expected: [Object],
      operator: 'rejects',
      diff: 'simple'
    }
    1
  ...
✖  Refusing to resume CI: failures reference files changed by this PR

View workflow run

[panva]

Exclude propagated make exit summaries from file attribution while retaining direct Makefile diagnostics and failures in changed tests.

Refs: nodejs/node#66228 (comment)