blacksmith.sh: Migrate workflows to Blacksmith

[blacksmith-sh[bot]]

This PR migrates some selected workflows to Blacksmith.

@jescalan note - this should be a pretty low effort way to make our CI faster & less expensive, with a very easy revert if it's not working out for us for any reason

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 58783dd487f33326d24f555bd85074075219a57d

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