Powermock does not support JUnit5 yet, so we need to remove it
to support JUnit 5. Additionally, maintaining additional libraries
adds extra work for the team.
Mockito now supports final classes and static method mocking. This
commit replaces Powermock with mockito-inline.
Closes gh-6025
Simplified the initial support to introduce fewer classes and only the
features described in the ticket.
Changed tests to align with existing patterns in the repository.
Added JavaDoc to remaining public methods introduced for this feature.
Issue: gh-6634
Issue: gh-6851
Rob Winch
Josh Cummings
Jérôme Wacongne