[Backport release-3_34] make QgsSettingsTree::treeRoot() available in Python bindings #33707

Job	Run time
build (22.04, 5, true, OFF, ON, ON, ON, ON, OFF, OFF, ON, false)	1h 31m 3s
build (22.04, 5, true, OFF, ON, ON, ON, ON, OFF, OFF, ON, false)	1h 31m 3s
build (38, 6, true, ON, OFF, ON, ON, OFF, OFF, ON, OFF, false)	2h 23m 18s
build (38, 6, true, ON, OFF, ON, ON, OFF, OFF, ON, OFF, false)	2h 23m 18s
clang-tidy (22.04, 5)	3m 23s
clang-tidy (22.04, 5)	3m 23s
Run tests (5, ALL_BUT_PROVIDERS)	28m 59s
Run tests (5, ALL_BUT_PROVIDERS)	27m 23s
Run tests (5, POSTGRES)	4m 21s
Run tests (5, POSTGRES)	4m 21s
Run tests (5, HANA)	4m 24s
Run tests (5, HANA)	4m 24s
Run tests (6, ALL_BUT_PROVIDERS)	9m 29s
Run tests (6, ALL_BUT_PROVIDERS)	9m 29s
Run tests (5, ORACLE, 22.04, binary-for-oracle)	4m 50s
Run tests (5, ORACLE, 22.04, binary-for-oracle)	4m 50s
	9h 37m 58s

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