Filter viable/strict failure report to only show required workflows

[mergennachin]

Here's the current summary: https://github.com/pytorch/executorch/actions/runs/21720882169/

Filter viable/strict failure report to only show required workflows

The failure summary was showing all failed workflows, including
"Update viable/strict" itself, which created self-referential noise.

Changes:

• Filter to only show workflows matching the requires patterns
  (pull, lint, trunk, Build documentation, Apple)
• Use exact matching with anchors (^pattern$) to prevent substring matches
• Use case-insensitive matching since workflow names may differ in case
• Show up to 5 failed jobs per commit, joined with
  in one table row
• Add "(up to 5 jobs)" to the header for clarity

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/17250

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 5 New Failures, 4 Unrelated Failures

As of commit 5d65b43 with merge base d9488fb ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 323a8975315745aa7c332d5f86092a7c1f3596c142607dd18b78e95bfee14103 /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 2ef9f59109d3a37ddffed3e4fe91e691a0f0a22fa6dd0eeeacc23cbabc0bf4fc /exec failed with exit code 1
• Test CUDA Builds / export-model-cuda-artifact (mistralai, Voxtral-Mini-3B-2507, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t b65120ad15fb35e4293a6c59f1424bf825665f294f2ecdcf27e120d7bb148ddd /exec failed with exit code 1
• Test CUDA Builds / export-model-cuda-artifact (nvidia, parakeet-tdt, non-quantized) / linux-job (gh)
  RuntimeError: Command docker exec -t 41a68cec6f115945bdcf9a7e05bcb62cee327c94f714ade4f91256d57c5518be /exec failed with exit code 1
• Test Metal Backend / test-metal-backend-modules / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 127

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / test-samsung-models-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-samsung-quantmodels-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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[github-actions]

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[Copilot]

Pull request overview

This PR filters the viable/strict failure report to only show workflows that are actually required for viable/strict updates, eliminating self-referential noise from the "Update viable/strict" workflow itself appearing in failure summaries.

Changes:

• Introduced a REQUIRED_PATTERN variable to match required workflows (pull, lint, trunk, Build documentation, Apple)
• Applied case-insensitive pattern filtering to three workflow query locations: commit-specific failures, recent main branch failures, and 24-hour summary statistics
• Added explanatory comments documenting the filtering logic and case-insensitive matching behavior

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