Make empty generated source files descriptive #102

Job	Run time
Soundness / Check generated code	1m 8s
Benchmarks / Construct Benchmarks matrix	2s
Soundness / Swift license headers check	6s
Cxx interop / Construct Cxx interop matrix	2s
Unit tests / Construct unit test matrix	3s
Examples / Linux (5.9)	22s
Examples / Linux (5.10)	23s
Examples / Windows (6.0)	3s
Examples / Linux (6.0)	7m 30s
Examples / Windows (nightly-6.0)	2s
Examples / Windows (nightly-main)	2s
Examples / Linux (nightly-6.0)	2m 59s
Examples / Linux (nightly-main)	3m 2s
Soundness / API breakage check	1m 6s
Soundness / Documentation check	1m 17s
Soundness / License headers check	3s
Soundness / Unacceptable language check	3s
Soundness / Broken symlinks check	2s
Soundness / Format check	37s
Soundness / Python lint check	5s
Soundness / Shell check	30s
Soundness / YAML lint check	3s
Benchmarks / Benchmarks / Linux (6.0)	2m 41s
Cxx interop / Cxx interop / Linux (6.0)	55s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 6s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 2s
Benchmarks / Benchmarks / Linux (nightly-6.0)	3m 11s
Benchmarks / Benchmarks / Linux (nightly-main)	2m 51s
Unit tests / Unit tests / Linux (6.0)	1m 27s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 36s
Unit tests / Unit tests / Linux (nightly-main)	1m 32s
	35m 51s

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