Fix failing Jetpack plugin JS Tests

[andrewserong]

Following on from #20512 which introduced Jetpack Boost, it appears that the Jetpack plugin JS tests have been failing (for extensions / blocks in particular). This seems to be to do with a version mismatch between the Jest version that the Jetpack plugin / Jetpack extensions tests were expecting and the one that was running. This PR updates the Jest dependency for the Jetpack plugin to > 27.

The helpful links I found while investigating the failing tests were:

• babel-jest createTransformer removed from Typescript? jestjs/jest#11444 (comment)
• 24.1.0: TypeError: Cannot read property 'cwd' of undefined jestjs/jest#7868

Screenshots

Before:

After:

Changes proposed in this Pull Request:

• Update Jest dependency for the Jetpack plugin to fix failing JS tests

Jetpack product discussion

Does this pull request change what data or activity we track or use?

Testing instructions:

• See if the CI JS test jobs complete, or to test locally:
• Go to projects/plugins/jetpack and run pnpm test-extensions to run tests. Check that they pass!
• Check that this hasn't caused any other tests / jobs to fail

[github-actions]

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Jetpack plugin:

• Next scheduled release: August 3, 2021.
• Scheduled code freeze: July 26, 2021.

[glendaviesnz]

This tested well for me. Jetpack plugin js tests failed on master, but complete successfully on this PR

[ramonjd]

The helpful links I found while investigating the failing tests were:

The same person answered both questions! Kudos!

[kraftbj]

I think we'll need to manually get the lock file back working on WP.com, but this will unblock master. Thank you!

[matticbot]

Caution: This PR has changes that must be merged to WordPress.com
Hello andrewserong! These changes need to be synced to WordPress.com - If you 're an a11n, please commandeer and confirm D65090-code works as expected before merging this PR. Once this PR is merged, please commit the changes to WP.com. Thank you!
This revision will be updated with each commit to this PR

[jeherve]

r229749-wpcom

[andrewserong]

Thanks Jeremy!