Add cron schedule for 8 am CT & 1 pm CT, and exclude dependabot & tgonzalezorlandoarm

[nil-is-all]

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[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16375

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❌ 3 New Failures, 2 Unrelated Failures

As of commit 6e437aa with merge base 39203cf ():

NEW FAILURES - The following jobs have failed:

• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh)
  RuntimeError: Command docker exec -t 53048446d669f8106b4fad7a137dd522708fe3fbc250e2e7a626f698046843c7 /exec failed with exit code 1
• Test CUDA Builds / check-all-cuda-builds (gh)
  Process completed with exit code 1.
• Test CUDA Builds / test-model-cuda-e2e (mistralai, Voxtral-Mini-3B-2507, quantized-int4-tile-packed) / linux-job (gh)
  RuntimeError: Command docker exec -t e62ee531cc3644058504c135645c86941ad6be9f605aeb7140a8768a6e7727f7 /exec failed with exit code 1

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• Test CUDA Builds / test-executorch-cuda-build-12.8 / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 1

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

• pull / android / run-emulator (gh) (#16137)
  Timeout waiting for emulator to boot.

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[Copilot]

Pull request overview

This PR enhances the GitHub workflow for adding unanswered external contributor PRs and issues to a PyTorch project by introducing automated cron schedules and improving bot/user exclusion logic.

• Adds cron schedules to run the workflow twice daily at 8 AM and 1 PM Central Time
• Introduces a new isBotOrExcluded function to centralize and improve bot/user filtering logic
• Adds "tgonzalezorlandoarm" and "dependabot[bot]" to the exclusion list

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[Copilot]

The function checks user.login on line 66 without first verifying that user.login exists. While line 60 checks if user is truthy, if user exists but user.login is null/undefined, this could cause issues. Consider adding a check like "if (user.login && excludedAuthors.has(user.login))" for consistency with the bot login check on line 64.

Suggested change

	if (excludedAuthors.has(user.login)) return true;
	if (user.login && excludedAuthors.has(user.login)) return true;