[DOC] Adding test suite organization documentation #1864

Job	Run time
Get Information	4s
tests minimal / build-test (3.10, ubuntu-latest)	2m 31s
tests / build-test (3.10, ubuntu-latest)	1m 58s
tests / build-test (3.10, windows-latest)	2m 26s
tests / build-test (3.10, macos-latest)	2m 4s
tests / build-test (3.14, ubuntu-latest)	1m 12s
tests / build-test (3.14, macos-latest)	2m 19s
tests / build-test (3.14, windows-latest)	2m 36s
tests_publish / merge_and_upload_test_data	7s
tests_publish / upload_coverage_data	7s
	15m 24s

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