Remove references to airbnb

Problem/Motivation

Drupal core has remove airbnb in #3440225: Update to ESLint v9 with standard rules

Proposed changes

Remove references to airbnb and anything else related to that change.

Remaining tasks

1. Create this issue in the Coding Standards queue, using the defined template
2. Add supporters
3. Create a Change Record
4. Review by the Coding Standards Committee
5. Coding Standards Committee takes action as required
6. Discussed at a Core Committee meeting, if it impacts Drupal Core
7. Final review by Coding Standards Committee
8. Documentation updates
   1. Commit the MR
   2. Publish change record
   3. Remove 'Needs documentation edits' tag
9. If applicable, create follow-up issues for PHPCS rules/sniffs changes

For a full explanation of these steps see the Coding Standards project page