Add filter for non-teams

[amrit110]

This pull request updates the scripts/collect_coder_analytics.py script to improve how workspaces are fetched and filtered, specifically by integrating Firestore to retrieve team mappings and using those mappings to exclude workspaces belonging to certain teams from analytics. The changes also update dependency requirements and error messaging.

Integration with Firestore and workspace filtering:

• Added a new get_team_mappings function to fetch participant team mappings from Firestore, mapping GitHub handles to team names.
• Updated the fetch_workspaces function to accept team mappings and filter out workspaces owned by users in excluded teams (facilitators and Unassigned).
• Modified the main workflow to first fetch team mappings from Firestore and then use them to filter workspaces for analytics.

Dependency and error handling improvements:

• Updated the import block to require both google-cloud-storage and google-cloud-firestore, and improved the error message to reflect both dependencies.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.09%. Comparing base (b6e4f05) to head (438c03e).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #42   +/-   ##
=======================================
  Coverage   88.09%   88.09%           
=======================================
  Files           3        3           
  Lines         462      462           
=======================================
  Hits          407      407           
  Misses         55       55           

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