feat: remove Transifex calls for OEP-58 for communication app

[sundasnoreen12]

INF-1278
Similar to openedx/frontend-app-discussions#682

Description
Changes

1. Removes all direct use of tx pull and tx push commands from the micro-frontend in favor of the atlas pull command.
2. Remove source and language translations from the repositories, hence no .json files will be committed into the repos.
3. src/i18n/index.js should export and empty array so the make pull_translations override it with the dynamic list of languages.

Merge Checklist

• If your update includes visual changes, have they been reviewed by a designer? Send them a link to the Sandbox, if applicable.
• Is there adequate test coverage for your changes?

Post-merge Checklist

• Deploy the changes to prod after verifying on stage or ask @openedx/edx-infinity to do it.
• 🎉 🙌 Celebrate! Thanks for your contribution.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.26%. Comparing base (6dd835d) to head (2a5cf01).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #200   +/-   ##
=======================================
  Coverage   83.26%   83.26%           
=======================================
  Files          47       47           
  Lines         693      693           
  Branches      136      136           
=======================================
  Hits          577      577           
  Misses        116      116           

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