Deduplicate merge queue/main CI attempt 2 - #16478
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Co-authored-by: Copilot <copilot@github.com>
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What does this change?
Refine our workflows so that most checks run either in the merge group or on merge to

main, as they are run against the exact same commit/code. Demonstrated by the way github shows both push and merge_group results in the PR checks:So with these changes, jobs now generally run on
pull_requestandmerge_groupevents, no longer thepushevent (which runs on push to main or pushes to PRs), just thecicd.ymlworkflow still runs onpush(to main) so that it can publish the artifact to riff-raff.Why?
Running everything on both is a waste of time/github action compute/chromatic tokens.