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 https://github.com/openedx/xblock-lti-consumer/pull/452 and contains a cherry-pick from it until that one is merged

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Changes

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

• [ ] https://github.com/openedx/wg-translations/issues/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[bot]]

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 :warning:

Additional details and impacted files

```diff @@ 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](https://app.codecov.io/gh/openedx/xblock-lti-consumer/pull/445/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openedx) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/openedx/xblock-lti-consumer/pull/445/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openedx) | `97.83% <91.66%> (-0.02%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openedx#carryforward-flags-in-the-pull-request-comment) to find out more.

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[OmarIthawi]

done @brian-smith-tcril

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@shadinaif 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.