Revert prettier upgrade and fix formatting #7891
Merged
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The version upgrade in #7741 is causing unexpected prettier diffs whenever we change certain files. This is because prettier 3.x introduced new formatting rules, but our prettier script only checks/formats changed files. So, in the upgrade PR, Checkstyle didn't complain about the formatting now being incorrect after the upgrade, and the latent formatting errors are being surfaced in PRs only as the files are edited.
This PR reverts prettier back to 2.1.1 and updates Checkstyle to catch this error in CI - if the prettier version in yarn.lock changes, then all files are checked/formatted, not just changed files.