feat: allow to embed superset dashboard in instructor dashboard

[Ian2012]

See openedx/openedx-aspects#192 for more information

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[bmtcril]

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[bmtcril]

@felipemontoya I know that you approved this code for inclusion in Open edX under the EduNEXT CLA elsewhere, but I forgot to ping you here, where people are more likely to look. Can you confirm that here as well?

[felipemontoya]

For sure, I commented that in openedx/openedx-aspects#193

As I said there, as the legal representative of edunext and the signer of the CLA I approve the change of license and the inclusion here.