Fix TestGitHubFolderCheckoutOptimization test expectation after checkout optimization

[Copilot]

Test TestGitHubFolderCheckoutOptimization/custom_checkout_keeps_github_sparse failed because its expectation was outdated after checkout optimization logic was introduced in commit 7ab8281.

Changes

• Updated test case: Renamed custom_checkout_keeps_github_sparse → custom_checkout_skips_github_sparse
• Updated expectation: Changed from expecting .github sparse checkout to be present (true) to expecting it to be skipped (false) when custom checkout steps exist
• Updated description: Reflects that sparse checkout is redundant when full checkout is already performed

Context

The new optimization in compiler_yaml_helpers.go correctly skips .github sparse checkout when custom steps contain actions/checkout, since the full repository checkout already includes .github. The test now validates this optimization works as intended.

# When this exists in custom steps:
steps:
  - name: Custom checkout
    uses: actions/checkout@v5

# The .github sparse checkout is now skipped (redundant)

Original prompt

Fix the failing GitHub Actions workflow test
Analyze the workflow logs, identify the root cause of the failure, and implement a fix.
Job ID: 62398072609
Job URL: https://github.com/github/gh-aw/actions/runs/21646008620/job/62398072609

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[Copilot]

Pull request overview

This PR fixes the test expectation for TestGitHubFolderCheckoutOptimization after checkout optimization logic was introduced in commit 7ab8281. The optimization correctly skips the .github sparse checkout when custom steps contain actions/checkout, as the full repository checkout already includes .github.

Changes:

• Updated test case name to reflect that custom checkout skips (rather than keeps) the .github sparse checkout
• Changed expectation from true to false to match the optimization behavior
• Updated test description to clarify the optimization logic

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