Update dev tool setup script to address Firebase emulator error

[vishnuravi]

Update dev tool setup script to address Firebase emulator error

♻️ Current situation & Problem

If the development tool setup script is run in a directory without a firebase.json file (i.e. outside of the Spezi Template Application repository) it throws an error when attempting to test the Firebase emulator suite. As this script installs tools that are independent of the Spezi Template Application itself, it should be able to run completely on its own.

⚙️ Release Notes

This PR adds a step in the setup script to create a temporary firebase.json if one does not exist before testing the firebase emulator suite. The file is removed before the script exits.

📝 Code of Conduct & Contributing Guidelines

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• I agree to follow the Code of Conduct and Contributing Guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.73%. Comparing base (630c1b7) to head (54afc9c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #95   +/-   ##
=======================================
  Coverage   86.73%   86.73%           
=======================================
  Files          21       21           
  Lines         693      693           
=======================================
  Hits          601      601           
  Misses         92       92           

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