Add Flutter runtime information #5709

Job	Run time
macos \| stable	36s
macos \| beta	55s
ubuntu \| stable	58s
cancel-previous-workflow	2s
ubuntu \| beta	1m 4s
windows \| stable	1m 0s
windows \| beta	1m 10s
analyze / analyze	47s
analyze / cancel-previous-workflow	2s
analyze / package-analysis	1m 24s
	7m 58s

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