Remove GA Analytics

[jwren]

Acknowledged and we can discuss more if you want. The counter argument though is that the Analytics API was designed with a GA-first mind set, and especially as time went on, the APIs were not called consistently, nor everywhere where we want them called from. I imagine that this PR will be used when the better analytics goes in, but now we'll have a clean history to improve code health and ultimately a better analytics story for the plugin.

[kenzieschmoll]

Ack. Do we still show the unified analytics prompt coming from the analysis server after this change? CC @bwilkerson As long as we are not removing that logic, then it's probably fine to remove all this.

[jwren]

The logic to notify the IDEs in a generic way for analytics goes through the DAS (non-flutter) protocol via the Dart plugin for IntelliJ. Relevant links:

• https://github.com/JetBrains/intellij-plugins/commit/7295e00684e2b12bc6ed8f43f9977f87d03cdf9e#diff-b2fa6867f6081548120831a6768ae898e285bd94ed032f3fc9a5713ab524251fR2176 & https://github.com/JetBrains/intellij-plugins/pull/888
• https://htmlpreview.github.io/?https://github.com/dart-lang/sdk/blob/master/pkg/analysis_server/doc/api.html#request_server.setClientCapabilities

[jwren]

Note: don't commit yet, the Flutter preference page has an issue with this PR, it needs to be fixed before this can land