Clean up commands for analytics opt out #132258

Currently we have two different flags that can be used for disabling analytics collection for the flutter tool. And this is because we currently have two different analytics systems within the flutter tool as we are incrementally migrating to package:unified_analytics

Note: although there are two commands for disabling analytics, they both did the same thing by opting out of the legacy analytics system and from the new package:unified_analytics system.

The legacy analytics system from package:usage used the following commands to enable and disable analytics

flutter config --no-analytics // to disable

flutter config --analytics // to enable

While package:unified_analytics used the following flutter commands to achieve the same results

flutter --disable-telemetry // to disable

flutter --enable-telemetry // to enable

This issue proposes we remove the flutter --disable-telemetry and flutter --enable-telemetry commands in favor of a new command below

flutter --disable-analytics // to disable

flutter --enable-analytics // to enable

Those commands are the same as dart --enable-analytics and dart --disable-analytics and result in less confusion.

Preventing Breaking Changes

The flutter --disable-telemetry and flutter --enable-telemetry are only 2 months old so likely won't break too many clients. However, flutter config --no-analytics and flutter config --analytics will likely break several clients so to prevent this, we will alias the following below.

So running:
flutter --disable-analytics will be an alias for flutter config --no-analytics
flutter --enable-analytics will be an alias for flutter config --analytics