Simplify and update code gen tests #9

Job	Run time
Soundness / Swift license headers check	3s
Soundness / API breakage check	1m 31s
Soundness / Broken symlinks check	3s
Soundness / Documentation check	1m 22s
Soundness / Format check	38s
Soundness / License headers check	5s
Soundness / Shell check	36s
Soundness / Unacceptable language check	2s
Soundness / Python lint check	5s
Soundness / YAML lint check	3s
Cxx interop / Cxx interop / Windows (nightly-6.0)	3s
Cxx interop / Cxx interop / Windows (6.0)	1s
Cxx interop / Cxx interop / Linux (5.9)	25s
Cxx interop / Cxx interop / Windows (nightly-main)	1s
Unit tests / Unit tests / Linux (5.9)	24s
Unit tests / Unit tests / Linux (5.10)	24s
Unit tests / Unit tests / Windows (6.0)	2s
Unit tests / Unit tests / Linux (6.0)	1m 18s
Cxx interop / Cxx interop / Linux (5.10)	25s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 35s
Cxx interop / Cxx interop / Linux (6.0)	1m 17s
Unit tests / Unit tests / Linux (nightly-main)	1m 25s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 31s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 32s
Unit tests / Unit tests / Windows (nightly-6.0)	2s
Unit tests / Unit tests / Windows (nightly-main)	1s
	14m 54s

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