Change @dataprovider to static in LoggerChannelTest

Fairly straightforward, move the mocks into the test method and control their creation via boolean flags - there were already if statements to handle them anyway.

Seems like a good refactor.

Committed/pushed to 11.x and cherry-picked to 10.3.x, thanks!

longwave → closed merge request !7765

Automatically closed - issue fixed for 2 weeks with no activity.