[Tensorflow] Add helper to reset all flags
[Tensorflow] Add helper to reset all flags

And call it from MlirCommonResetFlags, instead of resetting all flags
directly in the latter.

This is cleaner since it is now obvious that newly-added flags,
whether they are related or not to MlirCommonFlags, require
updates to both AllocateAndParseFlags() and ResetFlags().

PiperOrigin-RevId: 410898993
Change-Id: I8a4997e9fa57dbea9f412f87a7abb9a415e424dc

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