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.

Changes

• Removes direct use of tx pull and tx push commands
• 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 does not apply
• Remove transifex-client from requirements not available

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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[OmarIthawi]

@shadinaif we need to remove the translation files as well, probably in another pull request and mark them in .gitignore to avoid having atlas pull get this the platform into a dirty git status as it does now.

[shadinaif]

third party wiki and edx_proctoring_proctortrack need to be concatenated with django.po

[OmarIthawi]

Thanks @shadinaif, closing in favor of #34355 .

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