feat!: Remove Unused Libraries v2 Import API & LTI Tool

[kdmccormick]

Description

This removes two content_libraries features which are unused. Both features were developed during the Blockstore Libraries days (~2021, back when Libraries V2 was pre-alpha). They were ostensibly ported during the Blockstore->Core transition but I don't think we ever tested them and I'd be surprised if they still work. I think we should remove them now in order to avoid having to bring them along through any more refactorings :)

The features:

• The LTI 1.3 Provider Tool, which exposed library blocks via LTI. I believe this was developed for a HarvardX use case originally.
• The Course Import API. This was developed by 2U as an original attempt to move course content into V2 libraries, but it did not end up being used by anyone except developers. Please note that this is not the same as the Course Import feature which we are building for Verawood--that is built on the modulestore_migrator API.

Testing

When the sandbox comes up, I'll smoke test libraries, including the real Course Import feature (based on modulestore_migrator) to ensure it's not impacted.

Dev notes

The first commit was all a one-shot prompt to Sonnet 4.6:

let's remove some dead code from openedx-platform, primarily in the openedx/core/djangoapp/content_libraries folder (though there are tendrils elsewhere).

• the flag ENABLE_CONTENT_LIBRARIES_LTI_TOOL is always disabled. everything behind it is dead code. please remove
• the entire api/courseware_import.py module and all code that supports it or depends on it.

I reviewed the whole diff afterwards. The rest of the commits are me cleaning it up.

[kdmccormick]

@arbrandes , I think you were a dev on the LTI_TOOL implementation, right? Can I get your take on whether it makes sense to remove it at this point?

[arbrandes]

I'm actually surprised this is still here! I wasn't part of the migration from Blockstore, and it looks significantly different from what I remember.

Which is to say: if this is not a desired feature, I certainly have no objections to it being removed. :)

[kdmccormick]

@ormsbee @bradenmacdonald Could I get a review from one of you folks on this one? I think it's pretty straightforward, and it will make it easier for me to apply the openedx-core keys rework to openedx-platform next week.

[ormsbee]

😁

[bradenmacdonald]

@kdmccormick Actually we developed the LTI integration for MIT, I believe - to embed library content into canvas. @pdpinch do you know if MIT is still using that?

Was it really permanently disabled / impossible to enable?

[ormsbee]

My understanding was that it LTI never worked in the post-blockstore library world. @arbrandes: Do I remember correctly that you had context on this?