Also grey out the schema label when combobox is unavailable #47266

Job	Run time
build (ubuntu, 25.10, 6, true, ON, ON, ON, OFF, OFF, OFF, OFF, ON, ON, ON, ON, ON, ON, ON, ON, ON...	2h 3m 28s
build (fedora, 42, 6, true, ON, ON, OFF, OFF, ON, ON, ON, ON, OFF, OFF, OFF, OFF, OFF, OFF, OFF, ...	1h 58m 2s
clang-tidy (ubuntu, 25.10, 6)	7m 11s
Run tests (6, ubuntu, 25.10, HANA, .ci/test_blocklist_qt6_ubuntu.txt, binary-only)	12m 15s
Run tests (6, ubuntu, 25.10, SQLSERVER, .ci/test_blocklist_qt6_ubuntu.txt, binary-only)	9m 10s
Run tests (6, ubuntu, 25.10, POSTGRES, .ci/test_blocklist_qt6_ubuntu.txt, binary-only)	9m 16s
Run tests (6, ubuntu, 25.10, binary-only, .ci/test_blocklist_qt6_ubuntu.txt, ALL_BUT_PROVIDERS)	41m 33s
Run tests (6, fedora, 42, binary-only, .ci/test_blocklist_qt6_fedora.txt, ALL_BUT_PROVIDERS)	41m 40s
Run tests (6, ubuntu, 25.10, ORACLE, .ci/test_blocklist_qt6_ubuntu.txt, binary-for-oracle)	9m 12s
	6h 11m 47s

Provide feedback