CI: improve project tests logging

[eli-schwartz]

/cc @xclaesse

[eli-schwartz]

Example output: https://github.com/eli-schwartz/meson/actions/runs/6029933827/job/16360634546

[xclaesse]

I like it a lot, looks much better thanks!

While at it, something I've always wanted to change is tests that fails because there are unexepected installed files, the list of files is not printed in the summary of failed tests, you have to scroll all the way up to when it ran the test.

[jpakkane]

Looking nice. Would it be possible to make the Python unittest thingy output the brief dot format? Having a ton of lines like these is not very informative:

 unittests/machinefiletests.py::NativeFileTests::test_builtin_options_subprojects_overrides_buildfiles 
[gw1] [ 90%] PASSED unittests/machinefiletests.py::NativeFileTests::test_builtin_options_subprojects_overrides_buildfiles 

[eli-schwartz]

While at it, something I've always wanted to change is tests that fails because there are unexepected installed files, the list of files is not printed in the summary of failed tests, you have to scroll all the way up to when it ran the test.

Implemented in 71f5a12

Example log: https://github.com/eli-schwartz/meson/actions/runs/6042585162/job/16397982654#step:8:2447

[xclaesse]

LGTM, nice work!

[jpakkane]

FWICT Pytest still prints the long format for succeeding tests:

 unittests/platformagnostictests.py::PlatformAgnosticTests::test_setup_loaded_modules 
[gw0] [ 86%] SKIPPED unittests/platformagnostictests.py::PlatformAgnosticTests::test_setup_loaded_modules 

[jpakkane]

It's not mandatory, so ok to merge, but I feel it would improve readability.

[eli-schwartz]

Changing that would have been an additional commit, but I haven't yet looked at what, if anything, it is doing there.