Also grey out the schema label when combobox is unavailable #5402

Job	Run time
build (macos) (macos-15-intel, x64-osx-dynamic-release, 10.15, x86_64)	1h 6m 42s
build (macos) (macos-15, arm64-osx-dynamic-release, 11.0, arm64)	51m 33s
Create dmg	13m 52s
	2h 12m 7s

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