feat!: remove Transifex calls for FC-0012 - OEP-58

[shadinaif]

Breaking change!

This change breaks the Jenkins transifex integration which has been deprecated in favor of the new GitHub Transifex App integration as part of OEP-58.

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This PR depends on #452 and contains a cherry-pick from it until that one is merged

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Changes

• Removes direct use of tx pull and tx push commands from the XBlock to let Open edX manage it.
• Remove source and language translations from the repositories, hence no .po or .mo files will be committed into the repos.
• Remove Transifex related Makefile targets and configuration files.
• Use the OEP-58 JavaScript translations from the Open edX platform

Merge timeline

This should only be merged after Translation Infrastructure update OEP-58 is fully implemented.

The timing announcement will be shared by @brian-smith-tcril on #translations-project-fc-0012 Open edX Slack channel.

## Keep this pull request as a draft to prevent an accidental merge. ##

Pre-merge checklist

• Deprecate pre-OEP-58 Transifex scripts from all repositories wg-translations#20 is approved

References

This contribution is part of the FC-0012 project which is sparked by the Translation Infrastructure update OEP-58.

Up-to-date project overview and details are available in the Approach Memo and Technical Discovery: Translations Infrastructure Implementation document.

Join the conversation on Open edX Slack #translations-project-fc-0012.

Check the links above for full information about the overall project.

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[codecov]

Codecov Report

Attention: Patch coverage is 91.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 97.83%. Comparing base (516d289) to head (a9239d2).

Files	Patch %	Lines
lti_consumer/lti_xblock.py	90.90%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #445      +/-   ##
==========================================
- Coverage   97.85%   97.83%   -0.02%     
==========================================
  Files          77       77              
  Lines        6705     6710       +5     
==========================================
+ Hits         6561     6565       +4     
- Misses        144      145       +1     

Flag	Coverage Δ
unittests	97.83% <91.66%> (-0.02%)	⬇️

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[OmarIthawi]

@shadinaif code-wise this looks good and I've amended the pull request a bit.

We still need to update the README and test on devstack.

[OmarIthawi]

done @brian-smith-tcril

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