experiment: mask CustomPaint widget #7975

Job	Run time
cancel-previous-workflow	2s
android \| ubuntu \| stable	4m 42s
android \| ubuntu \| beta	5m 3s
ios \| macos \| stable	5m 56s
ios \| macos \| beta	5m 49s
macos \| macos \| stable	3m 44s
macos \| macos \| beta	3m 23s
linux \| ubuntu \| stable	3m 4s
linux \| ubuntu \| beta	4m 9s
windows \| windows \| stable	6m 46s
web \| ubuntu \| stable	3m 33s
web \| ubuntu \| beta	3m 33s
detekt	15s
ktlint	12s
pod-lint	3m 4s
swift-lint	29s
analyze / analyze	2m 48s
analyze / cancel-previous-workflow	7s
analyze / package-analysis	2m 34s
	59m 13s

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