fix: allow to embed dashboards in xblock

[Ian2012]

Description

This PR fixes the Superset XBlock:

• Current course filters are applied.
• The filter now only filters by org and course_key.

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

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[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
platform_plugin_aspects
__init__.py
utils.py
views.py
xblock.py
Project Total

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

[openedx-webhooks]

@Ian2012 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.