[GitHub Actions] Split the longest-to-run workflow job into two

[imnasnainaec]

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[codecov-commenter]

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[jmgrady]

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.github/workflows/frontend.yml line 40 at r1 (raw file):

      - run: npm run fmt-frontend-check
      - run: npm run lint
      - run: npm run build

Is this still required? We verify that the frontend builds correctly in the docker_build job.

Code quote:

      - run: npm run build

[jmgrady]

Reviewed 1 of 1 files at r1.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @imnasnainaec)