refactor: uninstall user_tasks app from lms (#27754)
refactor: uninstall user_tasks app from lms (#27754)

The user_tasks app is only needed by a cms feature.
However, it has been listed under INSTALLED_APPS
for both cms and lms because app-permissions only ran
in an lms context until recently.

Since app-permissions now creates the user_tasks_admin
group in a cms context, the app can be safely removed
from lms's INSTALLED_APPS.

TNL-8274
eduNEXT/edx-platform,arbrandes/edx-platform,angelapper/edx-platform,angelapper/edx-platform,arbrandes/edx-platform,angelapper/edx-platform,edx/edx-platform,eduNEXT/edx-platform,eduNEXT/edx-platform,edx/edx-platform,eduNEXT/edx-platform,angelapper/edx-platform,arbrandes/edx-platform,edx/edx-platform,edx/edx-platform,arbrandes/edx-platform