Sync labels ignore events

[soehms]

📚 Description

This PR removes the repository variable vars.SYNC_LABELS_BIDIRECT replacing it with vars.SYNC_LABELS_IGNORE_EVENTS. This enable a maintainer of the Sage repository to suspend the reaction of the bot on the events listed in the variable.

📝 Checklist

• The title is concise, informative, and self-explanatory.
• The description explains in detail what this PR is about.
• I have linked a relevant issue or discussion.
• I have created tests covering the changes.
• I have updated the documentation accordingly.

⌛ Dependencies

[gitpod-io]

[github-actions]

Documentation preview for this PR (built with commit 04aa4c2) is ready! 🎉

[soehms]

Test of new feature

Variable setting

Test

remove the s: needs review label which has been set automatically at opening of the PR:

Control

The unlabeled event has bben skipped: