Removed sync arg from wandb.log

[DanielNobbe]

Fixes #3471

Description:
Remove the sync argument from the wandb.log() calls in the OutputHandler and OptimizerParamsHandler, since the argument was removed. Kept the argument in the initialisation of the handlers, so that existing code that may include the argument keeps working.

Check list:

• New tests are added (if a new feature is added)
• New doc strings: description and/or example code are in RST format
• Documentation is updated (if required)

[vfdev-5]

LGTM, thanks @DanielNobbe !

[vfdev-5]

@DanielNobbe can you also please remove sync arg usage from tests/ignite/handlers/test_wandb_logger.py. Thanks!
and also fix the code style checker error: https://github.com/pytorch/ignite/actions/runs/19937571924/job/57228045157?pr=3472

[DanielNobbe]

Done. I didn't think of checking the tests, sorry about that.
I removed the one test that checked for the functionality of the sync argument, since the argument does nothing anymore. We don't have a test verifying that the sync argument does not trigger any errors, but I don't think that's necessary. If you would like me to add that test, let me know.

[vfdev-5]

Thanks @DanielNobbe ! That's fine as you did. Let's see if the CI is green and we can land it.