.github/workflows: Migrate workflows to Blacksmith runners

[blacksmith-sh]

To whomever may be reviewing this PR,

Blacksmith is the fastest way to run your GitHub Actions.

What does this PR change?

This PR has been automatically generated by a team member in your GitHub organization using Blacksmith's Migration Wizard, or MigWiz for short. This PR changes the following:

1. Your selected workflows will now run on Blacksmith's 2x faster hardware (e.g., runs-on: blacksmith-4vcpu-ubuntu-2204). Learn more about the different instances available to choose from.
2. Your jobs running on Blacksmith will now have all official GitHub and popular third-party cache actions automatically interact with our 4x faster, colocated cache. Learn more about Blacksmith's actions cache.
3. Your GitHub Actions will now actually be observable. Learn more about Blacksmith's logging and other observability features.
4. Your Docker builds will now automatically share their Docker layer cache, resulting in up to 40x faster builds. Learn more about Blacksmith's Docker layer caching.

FAQ

• Is this free? The first 3,000 minutes per month are free.
• Who uses Blacksmith? Clerk, Ashby, VEED, and 600+ others.
• What's the catch? There is none. Merge this thing already.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.68%. Comparing base (78fa820) to head (2d6552c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #561   +/-   ##
=======================================
  Coverage   99.68%   99.68%           
=======================================
  Files         261      261           
  Lines       28982    28982           
=======================================
  Hits        28890    28890           
  Misses         55       55           
  Partials       37       37           

Flag	Coverage Δ
unittests	99.68% <ø> (ø)

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