uses dvclive_test mode in examples/pytorch/test_accelerate_examples.py

[dberenbaum]

What does this PR do?

Fixes tests in examples/pytorch/test_accelerate_examples.py to use test mode for dvclive tracking, so that it does not try to do git operations in tests/CI.

Fixes comments here and here.

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Could you take a look @muellerzr? I didn't find anywhere else that needs a change, but you likely know better whether I missed any tests.

[muellerzr]

Thanks! Yes this is indeed the right place for it :)

[muellerzr]

cc @ArthurZucker this will fix a ton of pesky test failures in the examples :)

[ArthurZucker]

Thanks 🤗