Move platform requirements to availability annotations #19

Job	Run time
Test / Linux (5.9 - jammy)	57s
Test / Windows (5.9 - windows-2022)	11m 48s
Test / Linux (5.10 - jammy)	1m 2s
Test / Windows (6.0 - windows-2022)	16m 0s
Test / Linux (6.0 - jammy)	1m 9s
Test / Windows (6.1 - windows-2022)	14m 2s
Test / Linux (6.1 - jammy)	1m 8s
Test / Windows (nightly - windows-2019)	10m 53s
Test / Linux (nightly-main - jammy)	1m 20s
Test / Windows (nightly-6.1 - windows-2019)	11m 8s
Test / Linux (nightly-6.1 - jammy)	1m 22s
Soundness / Documentation check	1m 13s
Soundness / API breakage check	1m 22s
Soundness / Broken symlinks check	3s
Soundness / Format check	34s
Soundness / License headers check	4s
Soundness / Python lint check	5s
Soundness / Shell check	30s
Soundness / YAML lint check	3s
Soundness / Unacceptable language check	3s
	1h 14m 46s

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