test

Add `flutter.dev/to/team-infra`. (#11780) #4091

Job	Run time
Validate Firebase configuration	25s
Check if code excerpts are up to date	25s
Build site and check links	1m 46s
Analyze and test code examples (Beta channel, beta, false)	9m 4s
Analyze and test code examples (Stable channel, stable, true)	7m 50s
	19m 30s

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