In a previous PR #28686, the ability to see and enable/disable wiki and progress tabs was removed from studio along with the ability to re-order non-static tabs. The ability to toggle the Wiki tab was moved to the pages and resources section of the course authoring MFE. If that MFE is unavailable this means there is no way to show/hide the Wiki. This reverts some of the old changes if the pages and resources view is disabled.
- Moving xmodule folder to root as we're dissolving sub-projects of common folder in edx-platform
- More info: https://openedx.atlassian.net/browse/BOM-2579
- -e common/lib/xmodule has been removed from the requirements as xmodule has itself become the part of edx-platform and not being installed through requirements
- The test files common/lib/xmodule/test_files/ have been removed as they are not being used anymore
