Add Flutter runtime information #5719

Job	Run time
macos \| stable	54s
cancel-previous-workflow	2s
macos \| beta	46s
ubuntu \| stable	51s
ubuntu \| beta	35s
windows \| stable	1m 5s
windows \| beta	1m 17s
analyze / analyze	43s
analyze / cancel-previous-workflow	4s
analyze / package-analysis	1m 24s
	7m 41s

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