Deprecation collector

[chrisrueger]

This issue serves as a collector for potential candidates which could be removed in a future release.

• Deprecate biz.aQute.tester and biz.aQute.junit #6645
• [Deprecation] Deprecate Search/Query feature in BndPomRepository #6760 Searching in search.maven.org in BndPomRepository (docs) - search is now titled "legacy" without known replacement and causes breaking builds because of instabilities
• TODO

Also consider this page https://github.com/bndtools/bnd/wiki/WIP-Ideas:-bnd-8.0.0-breaking-changes

Please comment if other topics come to mind.