Fix "Check Correctness" job failure on CI

[ceyhun]

Fixes Check Correctness failure with Message: package-lock.json has changed. Please run npm install and commit the diff

It seems to be related to node and/or npm version. I bumped the docker node image in CircleCI to 14 and after updated package-lock.json running npm install.

I also added an extra command to print the git diff before failing a job.

To test:

Check if Check Correctness is passing on CircleCI.

PR submission checklist:

• I have considered adding unit tests where possible.
• I have considered if this change warrants user-facing release notes more info and have added them to RELEASE-NOTES.txt if necessary.

[peril-wordpress-mobile]

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[cameronvoell]

Looks good, and good thinking adding the echo "$diff"