fix: log missing repo directories instead of exiting

[OmarIthawi]

A missing directory happens due to many reasons including missing translations in the repository.

This can be painful to fix for maintainers, so atlas should recover from this error by skipping the missing directory, logging it and resuming the copying process.

Testing

• [x] Unit tests are added.
• [x] The tests has sneaked into the performance test since it's the only integration test we have.

References

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

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

Internalization is being rearchitected in Open edX Python, XBlock, Micro-frontend, and other projects. There are a number of immediately visible changes:

• Remove source and language translations from the repositories, hence no .json, .po or .mo files will be committed into the repos.
• Add standardized make extract_translations in all repositories
• Push user-facing messages strings into openedx/openedx-translations.
• Integrate root repositories with openedx/openedx-atlas to pull translations on build/deploy time

[openedx-webhooks]

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[openedx-webhooks]

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