ci: enable Copilot draft reviews and skip unrelated checks

[manuzhang]

Rationale for this change

ASF-managed Copilot code review is enabled for this repository, but automatic reviews are currently disabled while pull requests are drafts. Enabling draft reviews provides earlier feedback before human review is requested and complements the existing review-on-push setting.

A pull request changing only .asf.yaml also starts unrelated build and test workflows. Those workflows do not validate ASF repository configuration and consume unnecessary CI resources.

What changes are included in this PR?

• Enable automatic Copilot code review for draft pull requests in .asf.yaml
• Keep automatic Copilot review on new pushes enabled
• Ignore .asf.yaml-only pull requests in the sanitizer, AWS, C++ linter, SQL catalog, and general test workflows
• Keep the lightweight pre-commit and license workflows enabled for .asf.yaml changes
• Leave main branch and tag workflow triggers unchanged

Are these changes tested?

Yes. .asf.yaml and all modified workflow files were parsed successfully as YAML, the configured review_drafts value was verified as boolean true, and git diff --check passed.

Are there any user-facing changes?

No.

[Copilot]

Pull request overview

Enables ASF-managed GitHub Copilot code review to run automatically on draft pull requests, allowing earlier automated feedback while preserving the existing review-on-push behavior.

Changes:

• Set github.copilot_code_review.review_drafts to true in .asf.yaml
• Leave github.copilot_code_review.review_on_push enabled

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[Copilot]

Pull request overview

Copilot reviewed 7 out of 7 changed files in this pull request and generated no new comments.

[Copilot]

Pull request overview

Copilot reviewed 6 out of 6 changed files in this pull request and generated no new comments.