feat: added redirect to new instructor dash

[holaontiveros]

Description

This PR enables by default a redirection from the old instructor dashboard views to the new instructor dashboard front end app

• Course author, staff or anyone with the instructor dashboard access will now see by default the new frontendapp
• A waffle flag is introduced that will enable the legacy dashboard instructor.legacy_instructor_dashboard_mfe

Supporting information

relates to openedx/frontend-base#229

Testing instructions

While having the latest from tutor-mfe at the frontend-base branch:

• Try to access the instructor dashboard
• You should be redirected to the new instructor dash

Deadline

None

Other information

No database migrations, no runtime changes, no deprecations.

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[wgu-taylor-payne]

Thanks for taking this on! Here are some suggestions and things to think through.

[wgu-taylor-payne]

Thanks for the updates! Here are some further suggestions. Also, I want to make sure the implementation for the flag has more eyes on it than mine. @feanil @sarina.

[sarina]

Looks like enabling this flag is going to cause many instructor unit tests to fail because of 302 response instead of 200

[holaontiveros]

Looks like enabling this flag is going to cause many instructor unit tests to fail because of 302 response instead of 200

This is enabled by default, the flag disables it, but yes a couple of tests break, the tests are related with some email related tests that expected the old section of instructor to exists and even have the a link for email section even if the email section only had a link to the communications MFE

I'm fixing those by getting the flag enabled and letting the tests do their previous functionality