feat: support gleam-ts-mode (#4477) #5250

Job	Run time
test (ubuntu-latest, 27.2, false)	1m 54s
test (ubuntu-latest, 28.2, false)	2m 34s
test (ubuntu-latest, 29.3, false)	2m 32s
test (macos-latest, 28.2, false)	3m 43s
test (macos-latest, 29.3, false)	3m 35s
test (windows-latest, 27.2, false)	3m 15s
test (windows-latest, 28.2, false)	3m 5s
test (windows-latest, 29.3, false)	2m 41s
test (ubuntu-latest, snapshot, true)	1m 51s
test (macos-latest, snapshot, true)	2m 34s
test (windows-latest, snapshot, true)	40s
	28m 24s

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