Simplify and update code gen tests #10

Job	Run time
Soundness / Swift license headers check	3s
Soundness / API breakage check	1m 32s
Soundness / Broken symlinks check	2s
Soundness / Documentation check	1m 26s
Soundness / Format check	36s
Soundness / License headers check	2s
Soundness / Python lint check	6s
Soundness / Shell check	32s
Cxx interop / Cxx interop / Linux (5.9)	22s
Cxx interop / Cxx interop / Linux (5.10)	23s
Cxx interop / Cxx interop / Linux (6.0)	1m 15s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 33s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 30s
Cxx interop / Cxx interop / Windows (6.0)	1s
Cxx interop / Cxx interop / Windows (nightly-6.0)	2s
Cxx interop / Cxx interop / Windows (nightly-main)	2s
Soundness / YAML lint check	5s
Soundness / Unacceptable language check	3s
Unit tests / Unit tests / Linux (5.9)	23s
Unit tests / Unit tests / Linux (5.10)	21s
Unit tests / Unit tests / Linux (6.0)	1m 17s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 28s
Unit tests / Unit tests / Linux (nightly-main)	1m 35s
Unit tests / Unit tests / Windows (6.0)	2s
Unit tests / Unit tests / Windows (nightly-6.0)	2s
Unit tests / Unit tests / Windows (nightly-main)	1s
	14m 44s

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