Issue number: N/A
---------
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issue. -->
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etc). Submit multiple pull requests if needed. -->
## What is the current behavior?
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The sync script for the React package is out of date. It will
unintentionally delete the symlink directory of the build output from
`core/`, which breaks the build for the package during local
development.
## What is the new behavior?
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this PR. -->
- Updates the sync script to package and install the `core` package
- Matches the implementation pattern used for the sync script in our
other packages
## Does this introduce a breaking change?
- [ ] Yes
- [x] No
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and migration path for existing applications below. -->
## Other information
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screenshots of how the component looks before and after the change. -->
