removed deprecated ParameterGroupID

[niccolo-hare]

I removed all ParameterGroupID references within the Quickstart project for Analytics as it's already deprecated (see here) and was causing errors :

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[gemini-code-assist]

Code Review

This pull request removes the AnalyticsGroupJoin method and its associated UI button from the Analytics sample application. The reviewer suggests retaining this method to maintain a comprehensive example for users, proposing an update to use a string literal for the group ID parameter instead of removing the functionality entirely.

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analytics/testapp/Assets/Firebase/Sample/Analytics/UIHandler.cs (99-105)

Instead of removing the AnalyticsGroupJoin method, consider updating it to use the string literal "group_id". The EventJoinGroup event is still a standard recommended event, and keeping this example is beneficial for users of the quickstart to understand how to log group-related events.

    public void AnalyticsGroupJoin() {
      // Log an event with a string parameter.
      DebugLog("Logging a group join event.");
      FirebaseAnalytics.LogEvent(FirebaseAnalytics.EventJoinGroup, "group_id",
        "spoon_welders");
    }