fix(ci): Limit parallel jobs launched by the crates workflow #7754
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Motivation
Some workflows launch a lot of jobs, but those jobs are fast. So they can wait until later to run.
This also avoids hitting some rate limits.
Close #6702
Depends-On: #7616
Solution
Limit the number of parallel crate build jobs to avoid reaching rate-limits.
Limiting the number of parallel jobs also makes CI faster overall, because other long jobs can start earlier.
Review
This is a routine fix.
Reviewer Checklist
Follow Up Work
We could stop installing protoc that way if the bug happens again.