Add include/exclude label filters to conflicted PR action

[strawgate]

Summary

• Add include-labels and exclude-labels inputs to .github/actions/get-prs-with-merge-conflicts.
• Keep opt-out-label as a deprecated, backward-compatible exclusion that is merged into exclude-labels.
• Preserve existing outputs (prs, count) and conflict detection behavior.
• Normalize configured labels and PR label names to lowercase, making include/exclude matching case-insensitive.

Test plan

• Validate action YAML parses and passes lint checks.
• Verify label normalization and include/exclude filtering logic in the github-script step.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 14397add-f45d-48a5-9f31-674226adbf5f

📥 Commits

Reviewing files that changed from the base of the PR and between f313bb7 and 46127f2.

📒 Files selected for processing (1)

• .github/actions/get-prs-with-merge-conflicts/action.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/get-prs-with-merge-conflicts-label-filters

• 🛠️ Update Documentation: Commit on current branch
• 🛠️ Update Documentation: Create PR

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