Make empty generated source files descriptive #106

Job	Run time
Cxx interop / Construct Cxx interop matrix	5s
Benchmarks / Construct Benchmarks matrix	5s
Soundness / Check generated code	1m 23s
Soundness / Swift license headers check	6s
Unit tests / Construct unit test matrix	5s
Examples / Linux (5.9)	23s
Examples / Linux (5.10)	23s
Examples / Linux (6.0)	7m 49s
Examples / Linux (nightly-6.0)	2m 56s
Examples / Linux (nightly-main)	3m 1s
Examples / Windows (6.0)	2s
Examples / Windows (nightly-6.0)	1s
Examples / Windows (nightly-main)	2s
Soundness / API breakage check	1m 10s
Soundness / Documentation check	1m 17s
Soundness / Unacceptable language check	3s
Soundness / License headers check	3s
Soundness / Broken symlinks check	3s
Soundness / Format check	33s
Soundness / Shell check	35s
Soundness / YAML lint check	4s
Soundness / Python lint check	5s
Cxx interop / Cxx interop / Linux (6.0)	56s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 2s
Unit tests / Unit tests / Linux (6.0)	1m 25s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 39s
Unit tests / Unit tests / Linux (nightly-main)	1m 37s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 2s
Benchmarks / Benchmarks / Linux (6.0)	2m 29s
Benchmarks / Benchmarks / Linux (nightly-6.0)	3m 11s
Benchmarks / Benchmarks / Linux (nightly-main)	2m 46s
	36m 21s

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