Strip KBE dedup search suffix noise

[Copilot]

The KBE scanner can re-file the same CoreCLR runtime test when failures differ only by script-runner suffix or exit/signal text. This updates the shared existing-KBE search guidance so those variants resolve to the same bare test stem.

• Existing-KBE search

  • Extends stripped stem variation to remove .cmd, .dll, .sh, and .exe from slash-delimited CoreCLR test paths.
  • Adds exit-code/signal descriptor stripping for cases like exit 134, exit 101, and SIGABRT.

• Examples and guardrails

  • Documents the Refresh and arrres_il_r duplicate patterns.
  • Updates the suffix-stripping caveat and variation summary to match the new guidance.

• Fixes[ci-scan-feedback] Strip script-runner/exit-code suffixes in KBE dedup search to cut same-test duplicates #132132

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Pull request overview

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Suppressed comments (2)

.github/workflows/shared/create-kbe.instructions.md:76

• The guardrail says “Only strip the specific … exit-code/signal suffixes described in variation 6”, but variation 6 currently shows specific examples. This can unintentionally constrain stripping to just those example values (e.g., only exit 101/exit 134). Consider clarifying that this is a suffix pattern (e.g., exit <code> / SIG<signal>) rather than a fixed enumerated list.

underscore-delimited identifiers; GitHub search does not reliably prefix-match
them. Only strip the specific platform, architecture, type-width,
script-runner, and exit-code/signal suffixes described in variation 6.

.github/workflows/shared/create-kbe.instructions.md:60

• The guidance lists only a few concrete exit codes/signals (e.g., exit 101, exit 134, SIGABRT). Since the intent is to dedup the same test across any exit code/signal suffix noise, this can be misread as only stripping those specific values, which would keep producing duplicates for other exit codes/signals.

This issue also appears on line 74 of the same file.

 paths, also strip trailing script-runner suffixes (`.cmd`, `.dll`, `.sh`,
`.exe`) and exit-code/signal descriptors (`exit 134`, `exit 101`,
`SIGABRT`); search the bare stem in `in:title` and `in:body`. For example,
search `GC/API/Refresh/Refresh/Refresh` for both
`GC/API/Refresh/Refresh/Refresh` and `GC/API/Refresh/Refresh/Refresh.cmd`

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