fix: add instructor role to operators too

[Ian2012]

Allows Django staff users to see the course-level dashboards, currently they never get that permission.

Note: This behavior will give Django staff users access to all course data for all courses in Aspects.

Closes: openedx/openedx-aspects#291

[openedx-webhooks]

Thanks for the pull request, @Ian2012!

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[bmtcril]

What changed that made this necessary?

[Ian2012]

Nothing changed, it was a miss on our part on the last release. Site staff should have access to the instructor dashboards

[bmtcril]

Please add a PR description.