fix: remove deprecated settings waffle flags [FC-0123]

[rpenido]

Description

This PR removes deprecated waffle flags related to Settings pages

Supporting information

• Related to Info Sidebar: Settings #2786

Testing instructions

• Open a course
• Check if the menu items on the "Settings" menu work
• Check the links on the sidebar of a Settings page (i. e. Schedule & details) and make sure they are working.

Best Practices Checklist

We're trying to move away from some deprecated patterns in this codebase. Please
check if your PR meets these recommendations before asking for a review:

• Any new files are using TypeScript (.ts, .tsx).
• Avoid propTypes and defaultProps in any new or modified code.
• Tests should use the helpers in src/testUtils.tsx (specifically initializeMocks)
• Do not add new fields to the Redux state/store. Use React Context to share state among multiple components.
• Use React Query to load data from REST APIs. See any apiHooks.ts in this repo for examples.
• All new i18n messages in messages.ts files have a description for translators to use.
• Avoid using ../ in import paths. To import from parent folders, use @src, e.g. import { initializeMocks } from '@src/testUtils'; instead of from '../../../../testUtils'

[openedx-webhooks]

Thanks for the pull request, @rpenido!

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.53%. Comparing base (0c59b78) to head (37ae94c).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2959      +/-   ##
==========================================
+ Coverage   95.51%   95.53%   +0.01%     
==========================================
  Files        1330     1330              
  Lines       30582    30553      -29     
  Branches     6927     6697     -230     
==========================================
- Hits        29211    29189      -22     
- Misses       1303     1315      +12     
+ Partials       68       49      -19     

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[ChrisChV]

@rpenido, one question: why is support for these legacy pages being phased out? Have they already been deleted? Or is there a requirement for their removal? I still see these flags on edx-platform.

[ChrisChV]

Sorry, I just saw the comment on #2955 (comment)

[ChrisChV]

Looks good 👍

• I tested this: I followed the testing instructions
• I read through the code and considered the security, stability and performance implications of the changes.
• I tested that the UI can be used with a keyboard only (tab order, keyboard controls).
• Includes tests for bugfixes and/or features added.
• Includes documentation

[bradenmacdonald]

Nice cleanup! Thanks :)