feat: add openedx-app-ios with support for pre-extract step | FC-55

[OmarIthawi]

Changes

• Add https://github.com/openedx/openedx-app-ios to the list of supported repositories.
• Added support for optional translation requirements through before_translate step.

TODO

• Get the feat: atlas pull and push scripts | FC-55 openedx-app-ios#422 merged
• Test on our fork: Works okay https://github.com/Zeit-Labs/openedx-translations/blob/2cdaf2cb4bcf227a58669affb3bfa35dda17ecfd/translations/openedx-app-ios/I18N/I18N/en.lproj/Localizable.strings#L1-L110

Refs

This pull request is part of the FC-0055 project which implements the Translation Infrastructure update OEP-58 for mobile apps.

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[OmarIthawi]

@brian-smith-tcril I'd like your opinion here.

The pull request is ready for merge once the iOS PR is merged.

[OmarIthawi]

@Amr-Nash please checkout this pull request and let me know if all is okay.

[OmarIthawi]

Closing in favor of #6394

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