* Unit tests: replace mock and compat with code from community.internal_test_tools (#9921)
* Replace compat with equivalent from community.internal_test_tools.
* Replace mock with equivalent from community.internal_test_tools.
* Remove ignore.txt entries.
* Add test that's no longer present in later versions.
use dict comprehension in plugins, part 3 (#8833)
* use dict comprehension in plugins, part 3
* add changelog frag
(cherry picked from commit 26df6c7657)
Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>
