[#197] Fix: Add missing iOS configurations + refactor Firebase env for app distributions

[luongvo]

• Solves #197

What happened 👀

• Fix: Add missing APP_DISPLAY_NAME, DEVELOPMENT_TEAM and PROVISIONING_PROFILE_SPECIFIER config.
• Fix: wrong PRODUCT_BUNDLE_IDENTIFIER generating.
• Add missing Firebase Distribution tester group for iOS workflow + refactor to use FIREBASE_DISTRIBUTION_TESTER_GROUPS env.

Insight 📝

• The step Deploy to Firebase from iOS workflow is failed https://github.com/nimblehq/flutter-templates/actions/runs/5594410441/jobs/10229219912.

  /Users/runner/work/flutter-templates/flutter-templates/ios/Runner.xcodeproj: error: Signing for "Runner" requires a development team. Select a development team in the Signing & Capabilities editor. (in target 'Runner' from project 'Runner')
  note: Run script build phase 'Run Script' will be run during every build because the option to run the script phase "Based on dependency analysis" is unchecked. (in target 'Runner' from project 'Runner')
  note: Run script build phase 'Thin Binary' will be run during every build because the option to run the script phase "Based on dependency analysis" is unchecked. (in target 'Runner' from project 'Runner')
  ** ARCHIVE FAILED **
  [02:55:37]: Exit status: 65

• I missed comparing and adding these configs: APP_DISPLAY_NAME, DEVELOPMENT_TEAM, and PROVISIONING_PROFILE_SPECIFIER back to the base ios project from this PR.

• To keep Firebase Distribution env consistent between platforms, create a new FIREBASE_DISTRIBUTION_TESTER_GROUPS env variable.

Proof Of Work 📹

https://github.com/nimblehq/flutter-templates/actions/runs/5597650130/jobs/10236285462 ✅