Remove ValueGenerics feature from swift-syntax #94

Job	Run time
Run tests using swift-syntax-dev-utils (Linux)	24m 55s
Run tests using swift-syntax-dev-utils (Windows)	48m 45s
Validate generated code	3m 2s
Test / Linux (5.9 - jammy)	4m 0s
Test / Linux (5.10 - jammy)	3m 46s
Test / Linux (6.0 - jammy)	4m 14s
Test / Linux (nightly-main - jammy)	5m 4s
Test / Linux (nightly-6.1 - jammy)	4m 41s
Test / Windows (5.9 - windows-2022)	16m 39s
Test / Windows (6.0 - windows-2022)	17m 23s
Test / Windows (nightly - windows-2019)	15m 51s
Test / Windows (nightly-6.1 - windows-2019)	15m 27s
Soundness / API breakage check	0s
Soundness / Documentation check	4m 53s
Soundness / Broken symlinks check	6s
Soundness / Format check	48s
Soundness / License headers check	10s
Soundness / Shell check	34s
Soundness / Unacceptable language check	2s
Soundness / YAML lint check	3s
Soundness / Python lint check	6s
	2h 50m 29s

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