Change Superset link text, make the link optional

[bmtcril]

Closes https://github.com/openedx/tutor-contrib-aspects/issues/814

Merge checklist: Check off if complete or not applicable:

• [x] Version bumped
• [x] 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

[bmtcril]

This is in draft as I haven't tested the changes yet.

[github-actions[bot]]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
platform_plugin_aspects
__init__.py
platform_plugin_aspects/extensions
filters.py					42-43
Project Total

This report was generated by python-coverage-comment-action

[bmtcril]

I was able to test, this should be good to review now