Remove Redundant Host & Device Synchronizations

[alpha0422]

What does this PR do?

Fixes #21232.

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cc @csarofeen @ptrblck @eqy

[SkafteNicki]

Can we please add one or more unittests for this?
Mostly to check that we do not regress if changes are made to this part of the codebase?

[alpha0422]

Can we please add one or more unittests for this? Mostly to check that we do not regress if changes are made to this part of the codebase?

Good point, added a few unittests, thanks.

[alpha0422]

Hi @SkafteNicki, what should I do to move forward?

[SkafteNicki]

@alpha0422 PR looks fine to me. We are having progrems with our CI at the moment so it may take a bit of time before the PR is merged.