feat: session feedback #129

[georgfrodo]

closes #129

[rbento1096]

I have made some changes after testing:

• new fields (ratings and comments) on the session model were not loaded in the model, so they would be lost on if the session was edited
• In the back-end, you can't do 2 UPDATE operation on the same object, I refactored to make the comments update separate
• The comments and ratings fields did not exist on the existing data in the DB so the UPDATE also failed there. I made a script that added these fields to all records on the DB.
• The feedback conditionals (hasUserRated and hasSessionEnded) were working but the parent components were not updating the value on the child component.
• As a plus, I added custom error messages to the front-end depending on the cause of the feedback action failing.
• Changed the star color to yellow as the gray made it difficult to distinguish ratings when we are giving 5 stars.

Most of these errors were minimal or were back-end related (which you didn't have a way to test ofc) so all in all I'd say it's a great job!
Really liked the UI for the feedback as well! Both when submitting the feedback as well as the little info announcing a user has already submitted feedback for a session

Thanks a lot @georgfrodo