ci: Use golangci-lint-action

[abhinav]

Instead of downloading and installing golangci-lint manually, use the golangci-lint-action.

Besides caching Go-specific files, this also caches information computed by golangci-lint so lint checks should run faster.

For this change, I've left the version of golangci-lint the same as what we were using previously.

[abhinav]

Current dependencies on/for this PR:

• main
  • PR #474
  • PR #475
    • PR #473
    • PR #472 👈
  • PR #471
  • PR #469

This comment was auto-generated by Graphite.

[abhinav]

@abhinav started a stack merge that includes this pull request via Graphite.

[abhinav]

Graphite rebased this pull request as part of a merge.

[abhinav]

Graphite couldn't merge this PR because it failed optional checks and "ignore optional checks" was not selected.

[abhinav]

Flaky test (#481). Retrying