chore: use the PEP 508 format without editable VCS requirements

[MoisesGSalas]

Description

This change makes it possible to use uv as a pip replacement in order to perform a faster installation of requirements.

edx_proctoring_proctortrack already publishes to PyPI (although the release with Django 4.2 support has not been published), so we don't need to install the package as editable because the MANIFEST.in file already includes all the necessary extra files.

There was also the possibility of removing the package altogether, maybe we can make that push for the Sumak release?

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[mphilbrick211]

@MoisesGSalas - hi there! Flagging that an additional test has popped up that needs to be run.

@openedx/2u-arbi-bom flagging for review.

[MoisesGSalas]

@kdmccormick, I'm tagging you on this as I saw you were the one that discussed this package back in the Django 4.2 upgrade.

I don't really know the implications of this package, but removing it was also on the table, right? It's still the only github requirement en edx-platform, and after a year the new version has not been published.

[kdmccormick]

You're right @MoisesGSalas . This package has been in github.in for far too long. I've created #36329 . Assuming that is accepted, let's just fully remove edx-proctoring-proctortrack on April 5th, in time for the Teak cutoff.

If for reason that DEPR proposal is rejected, then let's re-open this PR and proceed with converting it to a non-editable requirement.

Thanks!