Closes #3870 Revert #3219: Add anchor link plugin for CKEditor5

[bberndt-uaz]

Description

This PR proposes to revert the addition of the CKEditor Anchor Link module due to some issues discovered as part of Quickstart 2.12 testing, including one that could result in data loss: IDs are stripped from links.

This reverts commit ae8c35f from pull request #3219.

Release notes

Related issues

• Anchor link plugin bugs/issues #3870

How to test

Probo review site: https://7b5e2985-cedf-4a13-ab91-3a35916c835d--pr-3872.probo.build

Types of changes

Arizona Quickstart (install profile, custom modules, custom theme)

• Patch release changes
  • Bug fix
  • Accessibility, performance, or security improvement
  • Critical institutional link or brand change
  • Adding experimental module
  • Update experimental module
• Minor release changes
  • New feature
  • Breaking or visual change to existing behavior
  • Upgrade experimental module to stable
  • Enable existing module by default or database update
  • Non-critical brand change
  • New internal API or API improvement with backwards compatibility
  • Risky or disruptive cleanup to comply with coding standards
  • High-risk or disruptive change (requires upgrade path, risks regression, etc.)
• Other or unknown
  • Other or unknown

Drupal core

• Patch release changes
  • Security update
  • Patch level release (non-security bug-fix release)
  • Patch removal that's no longer necessary
• Minor release changes
  • Major or minor level update
• Other or unknown
  • Other or unknown

Drupal contrib projects

• Patch release changes
  • Security update
  • Patch or minor level update
  • Add new module
  • Patch removal that's no longer necessary
• Minor release changes
  • Major level update
• Other or unknown
  • Other or unknown

Checklist

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My change requires release notes.

[bberndt-uaz]

We can track further efforts to add anchor link functionality to Quickstart with this issue:

• Add ability to create anchor links in text areas #3127