fix(feedback): deep merge custom styles with defaults (#5625) #10954

Job	Run time
Ready-to-merge gate / Missing "ready-to-merge" label	2s
diff_check / diff_check	4s
Build legacy ios dev no-frameworks	36m 38s
Build new ios production no-frameworks	41m 52s
Build new android dev no-frameworks	13m 38s
Build legacy macos dev no-frameworks	23m 12s
Build legacy android dev no-frameworks	11m 51s
Build legacy macos production no-frameworks	24m 22s
Build legacy android production no-frameworks	13m 40s
Build new ios dev no-frameworks	44m 34s
Build legacy ios production no-frameworks	38m 54s
Build legacy ios dev dynamic-frameworks	55m 29s
Build legacy ios production dynamic-frameworks	46m 19s
Build new android production no-frameworks	14m 6s
Test ios production REV2	13m 44s
Test android production REV2	5m 38s
diff_check / diff_check	4s
Build legacy android production no-frameworks	13m 40s
Build legacy android dev no-frameworks	11m 51s
Build legacy macos production no-frameworks	24m 22s
Build new android dev no-frameworks	13m 38s
Build legacy ios production no-frameworks	38m 54s
Build new android production no-frameworks	14m 6s
Build legacy ios production dynamic-frameworks	46m 19s
Build legacy ios dev dynamic-frameworks	55m 29s
Test android production REV2	5m 27s
Build legacy macos dev no-frameworks	23m 12s
Build legacy ios dev no-frameworks	36m 38s
Build new ios dev no-frameworks	44m 34s
Build new ios production no-frameworks	41m 52s
Test ios production REV2	13m 44s
Ready-to-merge gate / Missing "ready-to-merge" label	2s
	12h 47m 55s

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