## Overview
Reverts https://github.com/facebook/react/pull/26616 and implements the
suggested way instead.
This change in #26616 broken the internal sync command, which now
results in duplicated `@generated` headers. It also makes it harder to
detect changes during the diff train sync. Instead, we will check for
changes, and if there are changes sign the files and commit them to the
sync branch.
## Strategy
The new sync strategy accounts for the generated headers during the
sync:
- **Revert Version**: Revert the version strings
- **Revert @generated**: Re-sign the files (will be the same hash as
before if unchanged)
- **Check**: Check if there are changes **if not, skip**
- **Re-apply Version**: Now add back the new version string
- **Re-sign @generated**: And re-generate the headers
Then commit to branch. This ensures that if there are no changes, we'll
skip.
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Co-authored-by: Timothy Yung <yungsters@gmail.com>
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