fix: respond with useful information when cert is requsted

[ghassanmas]

This change simply makes the lms respond with useful data/status
when learner request for generating a certficate is met.

This might not have been an issue before (by before we refer to
the time when the learning expirence wasn't handled by the MFE
but through Django template base/server side rendering) however
currnelly (to my observation) this view is being only requested
as a RESTful by the MFE, thus this change:

• Transform it a RESTful type of view.
• Send useful information to the client back when exists

This change goes hand in hand with the learning MFE:

• fix: course certficate status after requesting frontend-app-learning#1348

More info/context is to be to come

Todo list:

• restrucuture/review the wording of code comments
• add more context about the appraoch
• add screen recorading for before and after fix
• add info for how to test/replicate
• one implementation is okyed by maintainer(s) check for tests

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[mphilbrick211]

Hi @ghassanmas! Just checking in to see if you plan to pursue this pull request?

[mphilbrick211]

Closing this for now - we can reopen in the future if needed.

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