Add Flutter runtime information (#2742) #5728

Job	Run time
macos \| stable	43s
cancel-previous-workflow	4s
macos \| beta	1m 0s
ubuntu \| stable	1m 5s
ubuntu \| beta	34s
windows \| stable	1m 24s
windows \| beta	2m 4s
analyze / cancel-previous-workflow	6s
analyze / analyze	44s
analyze / package-analysis	1m 33s
	9m 17s

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