Remove ValueGenerics feature from swift-syntax #119

Job	Run time
Run tests using swift-syntax-dev-utils (Windows)	43m 7s
Run tests using swift-syntax-dev-utils (Linux)	25m 8s
Validate generated code	3m 4s
Test / Linux (5.9 - jammy)	3m 50s
Test / Windows (5.9 - windows-2022)	19m 53s
Test / Linux (5.10 - jammy)	3m 57s
Test / Windows (6.0 - windows-2022)	15m 59s
Test / Linux (6.0 - jammy)	4m 12s
Test / Windows (nightly - windows-2019)	15m 21s
Test / Linux (nightly-main - jammy)	5m 8s
Test / Windows (nightly-6.1 - windows-2019)	14m 44s
Test / Linux (nightly-6.1 - jammy)	4m 38s
Soundness / API breakage check	0s
Soundness / Broken symlinks check	5s
Soundness / Documentation check	5m 6s
Soundness / Format check	42s
Soundness / Python lint check	5s
Soundness / License headers check	12s
Soundness / Shell check	42s
Soundness / Unacceptable language check	3s
Soundness / YAML lint check	3s
	2h 45m 59s

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