chore(spatial index): Remove duplicate rectangleToRegion code #36235

Job	Run time
build (24.04, 5, true, OFF, ON, ON, ON, ON, OFF, OFF, OFF, OFF, ON, false, ON)	33m 42s
build (39, 6, true, ON, OFF, ON, ON, OFF, OFF, ON, ON, ON, OFF, false, ON)	1h 0m 5s
clang-tidy (24.04, 5)	6m 2s
Run tests (5, ALL_BUT_PROVIDERS)	30m 20s
Run tests (5, POSTGRES)	8m 38s
Run tests (5, HANA)	14m 57s
Run tests (6, ALL_BUT_PROVIDERS)	37m 19s
Run tests (5, ORACLE, 24.04, binary-for-oracle)	7m 19s
	3h 18m 22s

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