[7.2.1] Allow discard previous overrides for --override_repository and --override_module #22784
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--override_module=foo=
will discard previous overrides specified by this option.Closes #22751.
PiperOrigin-RevId: 644253498
Change-Id: If723756433545bfc875d7f877d596f2e3f041464
Commit 82e3135