Set buttonStyle to be MainActor #886

Job	Run time
app-check-api-token-tests	6m 9s
grab-pr-body	3s
check-pr-body-for-key	2s
swift-button-functional-test	1m 2s
grab-pr-body	4s
app-check-api-token-tests	5m 10s
check-pr-body-for-key	2s
swift-button-functional-test	59s
	13m 31s

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