Backport #59092 Remove duplicate equality operator for QgsPointXY #33898

Job	Run time
build (22.04, 5, true, OFF, ON, ON, ON, ON, OFF, OFF, ON, false)	1h 30m 44s
build (38, 6, true, ON, OFF, ON, ON, OFF, OFF, ON, OFF, false)	2h 25m 2s
clang-tidy (22.04, 5)	3m 57s
Run tests (5, ALL_BUT_PROVIDERS)	27m 57s
Run tests (5, POSTGRES)	4m 27s
Run tests (5, HANA)	4m 41s
Run tests (6, ALL_BUT_PROVIDERS)	8m 58s
Run tests (5, ORACLE, 22.04, binary-for-oracle)	5m 27s
	4h 51m 13s

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