Add missing configuration options for the Ada Language Server. #5584

Job	Run time
test (ubuntu-latest, 27.2, false)	2m 11s
test (ubuntu-latest, 28.2, false)	2m 45s
test (ubuntu-latest, 29.4, false)	2m 41s
test (macos-latest, 28.2, false)	4m 25s
test (macos-latest, 29.4, false)	4m 36s
test (windows-latest, 27.2, false)	3m 34s
test (windows-latest, 28.2, false)	3m 30s
test (windows-latest, 29.4, false)	3m 52s
test (ubuntu-latest, snapshot, true)	56s
test (macos-latest, snapshot, true)	2m 28s
test (windows-latest, snapshot, true)	2m 0s
	32m 58s

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