* feat: add discussions tab
Adds code to load the discussions MFE in an iframe in the tab so the user isn't redirected to the LMS.
Adds code for the discussions tab, making it dynamically resize based on contents using a postMessage API.
* feat: update path based on user navigation inside discussions MFE
The discussions MFE will send path change events via the postMessage API so that the learning MFE path can be kept in sync. This will allow reloading a page without having the iframe revert to same path each time.
Remove redundant fields from courseware API. These are all found in courseHome:
- number
- org
- originalUserIsStaff
- isStaff
- verifiedMode
- isMasquerading (virtual field from isStaff and originalUserIsStaff)
Courseware and courseHome both provide tabs to the mfe.
This PR unifies the calls so that tab descriptions are only fetched from courseHome metadata
Remove jest-chain dependencies to make test errors more usable.
