Support tolerances for QgsRasterTransparency pixel values #31800

Job	Run time
build (22.04, 5, true, OFF, ON, ON, ON, ON, OFF, OFF, OFF, OFF, ON, false)	22m 30s
build (39, 6, true, ON, OFF, ON, ON, OFF, OFF, ON, ON, ON, OFF, false)	34m 48s
clang-tidy (22.04, 5)	8m 44s
Run tests (5, ALL_BUT_PROVIDERS)	30m 32s
Run tests (5, POSTGRES)	6m 22s
Run tests (5, HANA)	13m 30s
Run tests (6, ALL_BUT_PROVIDERS)	30m 53s
Run tests (5, ORACLE, 22.04, binary-for-oracle)	6m 35s
	2h 33m 54s

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