[ric-oliv]

Throwaway draft to measure three more changes on top of #5804's state. I'll close it after three runs and fold each change into the PR it belongs to.

1. The win-x64 and linux-x64 integration tests run in their own jobs, as the win-arm64 ones do since ci: measure the win-arm64 integration job on top of all CI changes (do not merge) #5803. On ci: measure the win-arm64 integration job on top of all CI changes (do not merge) #5803 the win-x64 leg was the slowest check at 26.6 to 28.4 minutes, and linux-x64 ends at about 23. Both runners have 4 cores, which the unit tests keep busy next to the integration tests.
2. verify-api's Windows job uses the fast drive step, the last Windows job without it.
3. The Windows jobs share their .NET toolchain through a cache. Every Windows job installs the same SDKs next to the workspace, and the arm64 ones the Android SDK, which their image lacks: 1 to 3.5 minutes per job. The environment action restores both from one cache per architecture and skips the installs on a hit. The workload restore still runs, for the job's own projects. The build legs save the cache on a miss. For this probe they save on the PR, so attempt 1 saves and attempts 2 and 3 restore. The real change would save on main only.

What I'm checking:

• The win-x64 and linux-x64 legs and their new integration jobs, against ci: measure the win-arm64 integration job on top of all CI changes (do not merge) #5803's 26.6 to 28.4 and about 23 minutes.
• The cache: its size, how long a restore takes on x64 and arm64 against the installs it replaces, and that every Windows job still builds after a hit.
• The same Pester results as before in each integration job.

#skip-changelog

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.13%. Comparing base (b41b96c) to head (e683a10).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5805   +/-   ##
=======================================
  Coverage   76.13%   76.13%           
=======================================
  Files         528      528           
  Lines       19579    19579           
  Branches     3829     3829           
=======================================
  Hits        14906    14906           
  Misses       3791     3791           
  Partials      882      882           

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