Rename `backgroundColor` to `backgroundStyle` #1736

Job	Run time
check-components-have-snapshots	9s
check-docc-referenced-types	1m 3s
build	5m 0s
test (iPhone SE (3rd generation), 16.4)	5m 48s
test (iPad (9th generation), 16.4)	8m 45s
regenerate_snapshots	0s
	20m 45s

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