Verify generated files are up to date in merge check

[johngmyers]

Issue

N/A

Description

Adds to the CI checks a verification that files generated by make generated are up-to-date.

An example of a failure is in #3006.

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the docs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[codecov-commenter]

Codecov Report

Base: 54.02% // Head: 54.02% // No change to project coverage 👍

Coverage data is based on head (0915057) compared to base (c94ffd3).
Patch has no changes to coverable lines.

Additional details and impacted files

@@ Coverage Diff @@ ## main #3007 +/- ## ======================================= Coverage 54.02% 54.02% ======================================= Files 144 144 Lines 8311 8311 ======================================= Hits 4490 4490 Misses 3493 3493 Partials 328 328 

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[kishorj]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: johngmyers, kishorj

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