[ric-oliv]

The four Android emulator jobs run on ubuntu-latest-4-cores, a larger runner, and each of them takes 15 to 23 minutes on a normal run.

#2139 moved them there in March 2023, because back then the 2-core standard Linux runners couldn't run a hardware-accelerated emulator. That has changed:

• Since April 2024, standard Linux runners support hardware-accelerated Android emulators. They need the same KVM udev rule this workflow already sets in "Enable KVM group perms".
• On public repositories, ubuntu-latest has 4 CPUs and 16 GB of RAM, the same cores as the larger runner.

This PR moves the emulator jobs to ubuntu-latest. The standard runner has less disk, and these jobs also install workloads and build the integration test app next to a 4 GB emulator disk, so each job prints the free space at the start and the end.

Measured on the first run, against the last 10 runs on the larger runner. All four emulator jobs passed on ubuntu-latest, in the default "GitHub Actions" runner group:

	ubuntu-latest-4-cores, last 10 runs	ubuntu-latest, this PR
Run Tests step	2.3 to 4.4 min	2.5 to 4.5
Run Integration Tests step	5.2 to 15.7	6.1 to 14.9
Device tests	2,921 run, 2,872 passed, 49 ignored	the same
Integration cases	12 on net9, 24 on net10	the same, all passed
Wait for a runner	up to 14 min in that sample. Over 90 days, 1 in 100 jobs waited 17 min or more	2 to 3 s
Free disk		88 GB at the start, 67 GB at the end, of 145 GB

So the emulator and the tests run just as fast on the standard runner, the jobs start within seconds instead of waiting for a larger runner, and the disk has plenty of room. The docs list 14 GB, but the runner has 145.

This run took 60 minutes, because Setup Environment hit the slow Mono download in 4 of the 6 jobs, taking 11.9 to 20.3 minutes. That's the download #5794 removes, and it hits both runner types.

#skip-changelog

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.12%. Comparing base (b41b96c) to head (a667215).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5795      +/-   ##
==========================================
- Coverage   76.13%   76.12%   -0.02%     
==========================================
  Files         528      528              
  Lines       19579    19579              
  Branches     3829     3829              
==========================================
- Hits        14906    14904       -2     
- Misses       3791     3792       +1     
- Partials      882      883       +1     

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