Simplify and update code gen tests #8

Job	Run time
Soundness / Swift license headers check	4s
Soundness / API breakage check	1m 33s
Soundness / Documentation check	1m 27s
Soundness / Unacceptable language check	2s
Soundness / Broken symlinks check	3s
Soundness / License headers check	2s
Soundness / Python lint check	5s
Soundness / Shell check	32s
Soundness / Format check	34s
Soundness / YAML lint check	2s
Cxx interop / Cxx interop / Linux (5.9)	24s
Cxx interop / Cxx interop / Linux (5.10)	24s
Cxx interop / Cxx interop / Linux (6.0)	1m 21s
Cxx interop / Cxx interop / Windows (6.0)	3s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 22s
Cxx interop / Cxx interop / Windows (nightly-6.0)	2s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 25s
Cxx interop / Cxx interop / Windows (nightly-main)	2s
Unit tests / Unit tests / Linux (5.9)	26s
Unit tests / Unit tests / Windows (6.0)	3s
Unit tests / Unit tests / Linux (5.10)	23s
Unit tests / Unit tests / Windows (nightly-6.0)	3s
Unit tests / Unit tests / Linux (6.0)	1m 24s
Unit tests / Unit tests / Windows (nightly-main)	3s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 25s
Unit tests / Unit tests / Linux (nightly-main)	1m 36s
	14m 50s

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