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?

[openedx-webhooks]

Thanks for the pull request, @MoisesGSalas!

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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.