fix(graphql): Prevent the graphql server from accidentally starting with a TypeSpec file #5590

Job	Run time
test (ubuntu-latest, 27.2, false)	2m 7s
test (ubuntu-latest, 28.2, false)	2m 40s
test (ubuntu-latest, 29.4, false)	3m 44s
test (macos-latest, 28.2, false)	5m 36s
test (macos-latest, 29.4, false)	10m 1s
test (windows-latest, 27.2, false)	13m 8s
test (windows-latest, 28.2, false)	11m 50s
test (windows-latest, 29.4, false)	6m 35s
test (ubuntu-latest, snapshot, true)	1m 11s
test (macos-latest, snapshot, true)	2m 27s
test (windows-latest, snapshot, true)	7m 18s
	1h 6m 37s

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