ci: run test and release once conformance ended

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Problem

• The list of gateways used by the frontend is not updated when PRs are merged

Background

• We have two workflows that run concurrently: "test & maybe release" and "Gateway Conformance Dashboard"
• Both workflows commit to the master branch
  • "test & maybe release": creates a release commit with the changelog
  • "Gateway Conformance Dashboard": creates a commit in the aggregate job which updates the conformance results example.
• A race condition between the two running causes the aggregate job to fail example example because other job already committed to the repo.

What this PR does

Ensures that the release commit only happens after the "Gateway Conformance Dashboard" workflow has completed (and committed the aggregated report list)

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So now that this has been merged, we have another problem, the release job doesn't run (https://github.com/ipfs/public-gateway-checker/actions/runs/7829778294), ostensibly because the job conditions are now different (https://github.com/ipdxco/unified-github-workflows/blob/31914bfda61680988993e1bf503e791342238abe/.github/workflows/js-test-and-release.yml#L190)

I'll create an issue for this.