CocoaPods flow step 2 - don't pod install unless project has plugins #9741
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For #9580
Reverts #9719
Only run pod install if the user uses pulls in pods via pub and plugins.
Also removes all references of the channel integration test's dependencies on cocoapods since the artifacts checked in were partial and wouldn't build without a first pod install even though it doesn't actually use cocoapods. (some context/assumptions in #9621)