fix(feedback): Deep merge custom styles with defaults in FeedbackWidget #5963

Job	Run time
Ready-to-merge gate / Missing "ready-to-merge" label	4s
diff_check / diff_check	10s
Build ios dev no-frameworks	23m 26s
Build ios production no-frameworks	30m 12s
Build android dev no-frameworks	17m 41s
Build web	4m 41s
Build ios dev dynamic-frameworks	24m 6s
Build android production no-frameworks	20m 33s
Build ios production dynamic-frameworks	21m 1s
	2h 21m 54s

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