Follow-up cleanup of GitHub Actions migration #28

Job	Run time
Unit tests / Linux (5.9)	3m 1s
Unit tests / Linux (5.10)	2m 53s
Unit tests / Linux (6.0)	2m 59s
Unit tests / Linux (nightly-6.0)	3m 29s
Unit tests / Linux (nightly-main)	3m 27s
Soundness / API breakage check	2m 42s
Soundness / Documentation check	2m 10s
Soundness / Unacceptable language check	3s
Soundness / Broken symlinks check	2s
Soundness / Format check	41s
Soundness / License headers check	4s
Soundness / Python lint check	6s
Soundness / Shell check	40s
Soundness / YAML lint check	4s
Cxx interop / Cxx interop / Linux (5.9)	1m 55s
Cxx interop / Cxx interop / Linux (5.10)	1m 35s
Cxx interop / Cxx interop / Windows (6.0)	2s
Cxx interop / Cxx interop / Linux (6.0)	1m 58s
Cxx interop / Cxx interop / Linux (nightly-6.0)	2m 23s
Cxx interop / Cxx interop / Linux (nightly-main)	2m 25s
Cxx interop / Cxx interop / Windows (nightly-6.0)	2s
Cxx interop / Cxx interop / Windows (nightly-main)	2s
	32m 43s

Provide feedback