Add Flutter runtime information #5711

Job	Run time
cancel-previous-workflow	3s
macos \| stable	39s
macos \| beta	54s
ubuntu \| stable	43s
ubuntu \| beta	47s
windows \| stable	1m 21s
windows \| beta	1m 12s
analyze / analyze	42s
analyze / cancel-previous-workflow	2s
analyze / package-analysis	1m 18s
	7m 41s

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