[BACKPORT][SUMAC] feat: [FC-0047] Implement user's enrolments status API (#2530)

[cmltaWt0]

Backport of #34859 to Sumac.

@KyryloKireiev please review this backport too.

[openedx-webhooks]

Thanks for the pull request, @cmltaWt0!

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[KyryloKireiev]

@cmltaWt0 I think everything is fine with this backport. We previously conducted a very long code review of the Pull Request with this API. We discussed and resolved all possible problems associated with the use of this mobile API. I think there should be no problems with this backport.

[mariajgrimaldi]

I agree with @KyryloKireiev. This looks good!