[ric-oliv]

Part 3 of 6 for #5806, based on #5808. The build legs built, ran the unit tests and then ran the integration tests, one step after another, and the app samples made their Build step longer. This PR moves both into jobs that run next to the legs, one commit each.

Build the app samples in their own job. The app samples only check that they compile, but their Release builds trim, AOT-compile and package each app. On macOS that was about 13.7 of the Build step's 28.3 task-minutes.

• A new Samples job builds all of them on macOS, the Android and MAUI samples on Linux, and the MAUI sample on Windows, which is the only build of its Windows target.
• The legs' solution filters drop them, regenerated from generate-solution-filters-config.yaml.
• So that msbuild.exe still builds an Android and a Windows app, the MSBuild job builds the MAUI sample after the solution filter. That takes about 3 minutes and the job still ends well before the slowest check.
• The only change in coverage is that win-arm64 no longer builds the MAUI sample. win-x64 builds the same targets.

Run the integration tests in their own jobs. A new integration-test matrix job runs next to the legs:

• On macOS it runs the MAUI cases, which build three Release apps and took 8 to 10 minutes of the macOS leg. They move unchanged from cli.Tests.ps1 to cli-maui.Tests.ps1, and the macOS leg skips them through SKIP_MAUI_TESTS.
• On linux-x64, win-x64 and win-arm64 it runs every integration test file, which those legs now skip.
• Each entry builds and packs only the packages its tests use. They aren't the packages the macOS leg publishes, but CI_PUBLISHING_BUILD only adds the other desktop platforms' native libraries and sentry-cli binaries, which these tests don't use.
• linux-arm64, linux-musl-arm64 and the macOS leg keep their integration tests, because they finish well before the slowest job.

On the stack's own three runs, #5812 with all 6 parts, the slowest check finished at 23.3, 25.5 and 24.3 minutes. On #5802, with the integration tests still in the legs, it was 32.4, and the win-arm64 leg was the slowest job at 31. On #5812, runs 1, 2 and 3:

	Leg	Integration job
win-x64	15.0, 16.4, 15.4 min	17.5, 17.5, 19.4
linux-x64	13.2, 13.7, 13.3	14.4, 13.6, 14.3
win-arm64	15.9, 16.7, 18.1	22.4, 21.0, 22.4
macOS	21.6, 16.0, 23.6	11.7, 24.5, 12.8, the MAUI cases

The macOS MAUI job depends a lot on the Mac it gets: on run 2 its build took 5.3 minutes against 2.5, and its tests 16.3 against 7.2. The three runs of the throwaway #5805 looked the same: legs 15.0, 11.2 and 17.9, integration jobs 18.5, 12.7 and 22.1. #5802 didn't have the other parts' later fixes either, so not all of those 9 minutes come from this PR.

The linux-x64, win-x64 and win-arm64 integration jobs each passed the same 69 tests and skipped the same 35 as their legs did before, and on all three runs of #5812. The first measurements of each change are in #5783 and #5797.

#skip-changelog

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.15%. Comparing base (d673987) to head (13de6a8).

Additional details and impacted files

@@                     Coverage Diff                      @@
##           ci/speed-up-windows-jobs    #5809      +/-   ##
============================================================
+ Coverage                     76.13%   76.15%   +0.02%     
============================================================
  Files                           528      528              
  Lines                         19579    19579              
  Branches                       3829     3829              
============================================================
+ Hits                          14906    14910       +4     
+ Misses                         3791     3788       -3     
+ Partials                        882      881       -1     

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