Remove `OrbitCustomButtonStyle` #1797

Job	Run time
build	3m 33s
check-components-have-snapshots	6s
check-docc-referenced-types	32s
test (iPhone SE (3rd generation), 17.0)	37m 33s
test (iPad (10th generation), 17.0)	40m 31s
regenerate_snapshots / generate_snapshots	12m 9s
	1h 34m 24s

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