Reliablility report is inaccurate

[MoLow]

I started investigating https://github.com/nodejs/node/issues/44805 when taking a look at https://github.com/nodejs/reliability/issues/388:

Reason	sequential/test-watch-mode-inspect
Type	JS_TEST_FAILURE
Failed PR	9 (https://github.com/nodejs/node/pull/44787/, https://github.com/nodejs/node/pull/44741/, https://github.com/nodejs/node/pull/44767/, https://github.com/nodejs/node/pull/44770/, https://github.com/nodejs/node/pull/44376/, https://github.com/nodejs/node/pull/44693/, https://github.com/nodejs/node/pull/44686/, https://github.com/nodejs/node/pull/44771/, https://github.com/nodejs/node/pull/44711/)
Appeared	test-nearform-macos10.15-x64-2, test-nearform-macos10.15-x64-1
First CI	https://ci.nodejs.org/job/node-test-pull-request/46819/
Last CI	https://ci.nodejs.org/job/node-test-pull-request/46857/

Example

not ok 3789 sequential/test-watch-mode-inspect
  ---
  duration_ms: 120.67
  severity: fail
  exitcode: -15
  stack: |-
    timeout
    TAP version 13
    (node:37761) ExperimentalWarning: The test runner is an experimental feature. This feature could change at any time
    (Use `node --trace-warnings ...` to show where the warning was created)
  ...

---

the first PR in the Failed PR row has two CI runs prior to this report: 46819, 46808

the first CI run reports a failure for this based on the previous osx1015 run https://ci.nodejs.org/job/node-test-commit-osx/47578/ that did not actually run in this build (due to java.net.ConnectException: Connection timed out) but Jenkins still considers the child of a previous run to be the child of this run.

this obviously happened in other PRS/CI runs as well, wich makes the report links and count very hard to rely on when investigating flaky test issues

[richardlau]

The reports here are generated using the ncu-ci walk ... command from node-core-utils.

[MoLow]

So this issue should be transferred, but I don't have write accees on the ncu repository so I cannot transfer it