qgsvector3d: Add support for minus operator #31546

Job	Run time
build (22.04, 5, true, OFF, ON, ON, ON, ON, OFF, OFF, OFF, OFF, ON, false)	1h 33m 34s
build (39, 6, true, ON, OFF, ON, ON, OFF, OFF, ON, ON, ON, OFF, false)	2h 45m 36s
Run tests (5, ALL_BUT_PROVIDERS)	29m 52s
clang-tidy (22.04, 5)	5m 51s
Run tests (5, POSTGRES)	9m 19s
Run tests (5, HANA)	7m 9s
Run tests (6, ALL_BUT_PROVIDERS)	33m 45s
Run tests (5, ORACLE, 22.04, binary-for-oracle)	8m 34s
	5h 53m 40s

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