fix: re-add missing interfaces

[metacosm]

Description

Fixes #4022

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change
• Chore (non-breaking change which doesn't affect codebase;
  test, version modification, documentation, etc.)

Checklist

• Code contributed by me aligns with current project license: Apache 2.0
• I Added CHANGELOG entry regarding this change
• I have implemented unit tests to cover my changes
• I have added/updated the javadocs and other documentation accordingly
• No new bugs, code smells, etc. in SonarCloud report
• I tested my code in Kubernetes
• I tested my code in OpenShift

[rohanKanojia]

Could you please add some tests for DSL cases which are reintroduced by this PR?

[metacosm]

Could you please add some tests for DSL cases which are reintroduced by this PR?

Don't really have time for this at the moment… Feel free to add them.

[shawkins]

LGTM

Deletable is effectively available here via FilterWatchListMultiDeletable

[metacosm]

True but I added it for completeness sake.