feat!: Drop support for the legacy video upload page.

[feanil]

The legacy video uploads page in Studio has been replaced with a new
view in the Authoring MFE. This change removes the now unused
JS/CSS/HTML/Python related to the old video page.

This work is part of #36108

BREAKING CHANGE: The contentstore.new_studio_mfe.use_new_video_uploads_page
waffle flag is no longer respected. The code operates as if this is set to True.

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[kdmccormick]

Wow, net -7000, nice 🔥

I didn't even realize there was a legacy video uploads page! Is it this? https://edx.readthedocs.io/projects/edx-partner-course-staff/en/latest/video/upload_video.html

Regarding the contentstore.new_studio_mfe.use_new_video_uploads_page--I think this is unfortunately a bit complicated. We had discussed in slack a while back: https://axim-collaborative.slack.com/archives/C03R320AFJP/p1740423161502069?thread_ts=1740064169.548659&cid=C03R320AFJP. Basically, the page requires edx-val, so it only works on edx.org or any other site which has managed to reverse-engineer the edX video pipeline enough to get uploads working (unclear to me if any such sites exist). With the waffle flag enabled, here's what Content > Videos looks like on the Ulmo sandbox:

I remember us discussing in standup (and hinted in that thread) that someone could maybe work on a version of the MFE page which didn't include any of the edX-specific stuff, and exposed plugin slots which edX could plug their stuff into. But I don't know what that would look like and I'm not sure who would do it. I think our options for the purpose of the legacy studio removal are either
(a) rip this new edX-specific MFE page out too now, or
(b) remove the legacy page right now, but leave the new page and its waffle flag in, punting that issue for a later time.

[feanil]

(b) remove the legacy page right now, but leave the new page and its waffle flag in, punting that issue for a later time.

You're saying keep the cleanup but leave the waffle flag in place so that the new MFE page remains off by default since it's actually useless for non edx.org operators at the moment? If we do that, we have to answer the question of what does the backend do when the waffle flag is set to false and there is no old page to display. I think this means we update the code to not provide links to the video page in this case and so we'll need to update other older templates to put conditional around those references. Does that sound right to you @kdmccormick ?

[kdmccormick]

I think this means we update the code to not provide links to the video page in this case and so we'll need to update other older templates to put conditional around those references.

Good question, the thing is I'm not actually sure how one gets to the legacy video page, up until now I didn't know it even existed. Do you know how it's accessed today? Is it possible it's already behind some flag? If the new uploads page is fully edX-specific, then I'd guess that the legacy page is edX-specific too.

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