feat: migrates SupersetXBlock

[pomegranited]

Description

Migrates the SupersetXBlock code from https://github.com/eduNEXT/platform-plugin-superset

and

• use settings.SUPERSET_CONFIG instead of storing sensitive data in XBlock fields (superset_url, superset_username, superset_password)
• modifies settings.SUPERSET_CONFIG to better distinguish between the (public) service_url and the (docker) internal_service_url
• simplifies the XBlock by using StudioEditableXBlockMixin
• removes unused code and files.

Also adds a "Go to Superset" link to the Instructor Dashboard, to allow users to navigate directly to Superset.

Testing instructions

See openedx/tutor-contrib-aspects#642 for manual testing instructions.

Screenshots

XBlock edit screen:

XBlock staff/instructor view:

XBlock learner view:

Instructor Dashboard "Go to Superset" link:

Merge checklist:
Check off if complete or not applicable:

• Version bumped
• Changelog record added
• Documentation updated (not only docstrings)
• Fixup commits are squashed away
• Unit tests added/updated
• Manual testing instructions provided
• Noted any: Concerns, dependencies, migration issues, deadlines, tickets

[openedx-webhooks]

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[Ian2012]

Thanks for this contribution! Looking great, just a couple of comments and a problem with a dependency

[pomegranited]

Thank you for your review @Ian2012 ! If you're happy with my changes, feel free to merge & tag, and I'll update openedx/tutor-contrib-aspects#642 (comment)

[bmtcril]

Nice, I'm excited to get this in! :)

[pomegranited]

Hi @Ian2012 , I'm not sure why you're not seeing the XBlock in your course? Could you check that the installed version of platform-plugin-aspects matches this branch?

FYI I just pushed another commit to this branch. With this change, you should see a "Go to Superset" link on the Instructor Dashboard plugin.

[Ian2012]

Pushed a commit to fix this small bug in which the plugin was using the internal_service_url in production which cannot be allowed unless the allow insecure OAuth request which shouldn't be enabled in production:

[openedx-webhooks]

@pomegranited 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.

[pomegranited]

@Ian2012 Thank you!