[DEPR]: Account pages -> micro-frontend

[feanil]

As part of our re-platforming effort, we are replacing Django-server-side rendered frontend implementations in favor of React-based micro-frontend implementations. This ticket covers the pages related to Accounts:

• Learner Profile page
• Order History page
• Account Settings page

Removal

We are removing edx-platform's older implementation of the Django-server-side rendering of the following pages:

• Learner Profile page (see openedx/features/learner_profile)
• Order History page (see get_user_orders)
• Account Settings page (see settings_views)

Replacement

We are replacing these pages with new micro-frontend-based implementations:

• Learner Profile page: edx/frontend-app-profile
• Order History page: edx/frontend-app-ecommerce
• Account pages: edx/frontend-app-account
  ** Account Settings

Target Dates

NOTE: Remember to update the annotation in the code once we are closer to the date and have a better understanding of the target dates.

• Communication: https://discuss.openedx.org/t/deprecation-removal-legacy-frontend-implementations-depr-17-depr-42-depr-109/3193
• Accepted (deadline for comments before acceptance): 2020-10-05 (World Teacher's Day)
• Removed: 2021-04-10
• First named release without it: TBD (Lilac? Maple?)

Additional Info

Original Jira Issue: https://openedx.atlassian.net/browse/DEPR-17

Latest comment from Diana:

Update: now that the new MFE is on by default in Lilac, we can start the work to remove this. There may not be resources allocated this on edX’s side for a bit of time, though.

[dianakhuang]

We believe this is now unblocked for 2U with the deployment of the account and profile MFEs in edge. @abdullahwaheed are you still going to own this or can we ask @arbrandes to help get the removal PR over the line again?

[feanil]

@abdullahwaheed is there a PR to remove the old code? Can this be removed now?