fix: make webpack cache work

[ambar]

Summary

See https://webpack.js.org/api/node/#run

Don't forget to close the compiler, so that low-priority work (like persistent caching) have the opportunity to complete.

turbo run build && yarn workspace testerapp run bundle:ios

# without cache
webpack 5.75.0 compiled successfully in 14680 ms 
# with cache
webpack 5.75.0 compiled successfully in 1000 ms

Test plan

[changeset-bot]

🦋 Changeset detected

Latest commit: a80e924

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
testerapp	Patch
@callstack/repack	Patch

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[RafikiTiki]

Looks good, thanks for the contribution – the compiler.close was obviously missed there 🙌

[jbroma]

Thank you for your contribution @ambar, great stuff 🚀