[Backport release-3_40] [qgis.PyQt] Add qgis.PyQt.QtMultimedia #36618

Job	Run time
build (24.04, 5, true, OFF, ON, ON, ON, ON, OFF, OFF, OFF, OFF, ON, false)	1h 52m 46s
build (39, 6, true, ON, OFF, ON, ON, OFF, OFF, ON, ON, ON, OFF, false)	3h 6m 21s
clang-tidy (24.04, 5)	5m 0s
Run tests (5, ALL_BUT_PROVIDERS)	29m 56s
Run tests (5, POSTGRES)	8m 1s
Run tests (5, HANA)	5m 47s
Run tests (6, ALL_BUT_PROVIDERS)	36m 48s
Run tests (5, ORACLE, 24.04, binary-for-oracle)	6m 13s
	6h 30m 52s

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