experiment: mask CustomPaint widget #7943

Job	Run time
cancel-previous-workflow	2s
android \| ubuntu \| stable	5m 10s
android \| ubuntu \| beta	5m 11s
ios \| macos \| stable	4m 2s
ios \| macos \| beta	4m 34s
macos \| macos \| stable	3m 22s
macos \| macos \| beta	4m 4s
linux \| ubuntu \| stable	3m 2s
linux \| ubuntu \| beta	3m 12s
windows \| windows \| stable	7m 30s
web \| ubuntu \| stable	3m 37s
web \| ubuntu \| beta	3m 40s
detekt	14s
ktlint	18s
pod-lint	2m 22s
swift-lint	35s
analyze / analyze	2m 33s
analyze / cancel-previous-workflow	3s
analyze / package-analysis	2m 41s
	56m 12s

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