Remove deprecated args in trainers

[qgallouedec]

What does this PR do?

Fixes # (issue)

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[lewtun]

Overall I'm happy to remove these args, but since it's technically a breaking change I wonder if we need to specify the specific version we'll do this in (currently set to v1.0.0 which is too far away I guess)

Also it would be good to have a small PR description as I wasn't quite sure what the motivation of this PR was :)

[lewtun]

Out of curiosity, is the reason to remove these deprecated args due to the fact we've had this warning for several releases?

I wonder if it's better to pin the version to 2-3 future versions to give people a concrete warning?

[qgallouedec]

For context, these arguments have been deprecated in #1554, in v0.9.3.

Sounds good, let's wait a bit.