Fix Element Enterprise nightly build and publication using App Distribution

[bmarty]

Type of change

• Feature
• Bugfix
• Technical
• Other :

Content

Ensure that the codebase correctly create EE nightly build.
Also made some change on the Firebase console to allow nightly to be published.

Motivation and context

Nightly build for Element Enterprise

Screenshots / GIFs

NA

Tests

• In App Tester application, observe the Element Enterprise is available.

Tested devices

• NA

Checklist

• Changes have been tested on an Android device or Android emulator with API 23
• UI change has been tested on both light and dark themes
• Accessibility has been taken into account. See https://github.com/element-hq/element-x-android/blob/develop/CONTRIBUTING.md#accessibility
• Pull request is based on the develop branch
• Pull request title will be used in the release note, it clearly define what will change for the user
• Pull request includes screenshots or videos if containing UI changes
• Pull request includes a sign off
• You've made a self review of your PR

[github-actions]

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[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.95%. Comparing base (1c8d1f7) to head (0d8064b).
Report is 7 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3130   +/-   ##
========================================
  Coverage    75.95%   75.95%           
========================================
  Files         1638     1638           
  Lines        38630    38630           
  Branches      7464     7464           
========================================
  Hits         29343    29343           
  Misses        5399     5399           
  Partials      3888     3888           

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