Tracker issue for the migration from GA3 to GA4 with the use of package:unified_analytics

Tasks:

• Setup the analytics instance to use the same logic as package:usage for initialization
  • Update logic for getting Analytics instance from package:unified_analytics #134756
• Migration of doctor events from DoctorResultEvent
  • PR in dart-lang/tools to add event: Enum + event constructors added for doctor events dart-lang/tools#178
  • PR in flutter/flutter to use new event: Unified analytics events for doctor validators #136647
• Migration of build events from BuildEvent
  • PR in dart-lang/tools to add event: Enum + event constructors added for build events dart-lang/tools#187
  • PR in flutter/flutter to use new event: Unified analytics events migration for BuildEvent #137562
• Migration of hot reload events from HotEvent
  • PR in dart-lang/tools to add event: Added new event enum + constructor for hot runner dart-lang/tools#193
  • PR in flutter/flutter to use new event: Migration for HotEvent for Flutter hot runner #137717
• 🚫 Migration of event PubResultEvent -- Migration is not necessary since pub will be sending its own events soon
  • PR in dart-lang/tools to add event: Enum + event constructor for pub result events dart-lang/tools#194
  • PR in flutter/flutter to use new event: Migrating the PubResultEvent to package:unified_analytics #138012
• Migration of event CommandResultEvent and Usage.command
  • PR in dart-lang/tools to add event: Enum + event constructor added for flutterCommandResult dart-lang/tools#199
  • PR in flutter/flutter to use new event: CommandResultEvent migrated #138165
  • PR in dart-lang/tools to add commandHasTerminal param: Add terminal info to flutter command event dart-lang/tools#204
  • PR in flutter/flutter to include commandHasTerminal param: Add commandHasTerminal parameter + apple usage event + sendException events for package:unified_analytics #138806
• 🚫 Migration of event AnalyticsConfigEvent
  • Not necessary because package:unified_analytics already emits an event on opt out/in
• Migration of event CodeSizeEvent
  • PR in dart-lang/tools to add event: Add enum + event constructor for code size analysis dart-lang/tools#200
  • PR in flutter/flutter to use new event: Unified analytics migration for CodeSizeAnalysis #138351
• 🚫 Migration of event ErrorHandlingEvent
  • Not necessary because there are no callers of this event
• 🚫 Migration of event [NullSafetyAnalysisEvent]
  • PR in dart-lang/tools to add event: New enum + constructor added for nullSafetyMigrationResult dart-lang/tools#202
  • PR in flutter/flutter to use new event: Migration for NullSafetyAnalysisEvent to package:unified_analytics #138419
• Migration of event UsageEvent – these events are all ios/macos related
  • PR in dart-lang/tools to add event: Add generic usage event used for iOS/macOS workflows + generic exception event dart-lang/tools#206
  • PR in flutter/flutter to use new event: Add commandHasTerminal parameter + apple usage event + sendException events for package:unified_analytics #138806
• Migration of sendException
  • PR in dart-lang/tools to add event: Add generic usage event used for iOS/macOS workflows + generic exception event dart-lang/tools#206
  • PR in flutter/flutter to use new event: Add commandHasTerminal parameter + apple usage event + sendException events for package:unified_analytics #138806
• Migration of timing events (sendTiming method)
  • PR in dart-lang/tools to add event: Added enum + event for timing events dart-lang/tools#208
  • REVERTED PR in flutter/flutter to use new event: Migration for the sendTiming events for package:unified_analytics #138896
    • PR for Relanding in flutter/flutter: [Reland] Migration for the sendTiming events for package:unified_analytics #139299
• Migration of the CustomDimensions which are sent from the FlutterCommand.verifyThenRunCommand
  • PR in dart-lang/tools to add event: Enum + event added for commandUsageValues dart-lang/tools#211
  • PR in flutter/flutter to use new event: Migrate command usage values #139383

Post migration updates needing to be made

• Send enabled features with each event
  • PR in dart-lang/tools to add parameter: Add enabledFeatures key to Analytics constructors dart-lang/tools#217
  • PR in flutter/flutter to use new parameter: Use new enabledFeature param for Analytics #139934
• Remove legacy code from flutter/flutter
  • PR in flutter/flutter: TBD

Cherrypicks into stable

• PR in flutter/flutter: [CP] Migrate command usage values (#139383) #141019