Added Course Copying Feature for Non-Admins on Programs & Events Dashboard

[PR4NJ41]

What this PR does

This PR adds the functionality of copying a course, along with its timeline for Non-Admins from Wiki-Edu dashboard to Programs & Events Dashboard. Additionally, it makes copying of user data optional for both dashboards and provides an option to update course details after the course is copied.

Detailed Changes:

• [X] Improved UI of the copy_course page.
• [X] Added Copy Course from another Server button on Homepage.
• [X] Made copying of User_data optional for both the Dashboards.
• [X] Added permission for non-admins to access 'copy course' page on P&E dashboard.
• [X] Added cloned modal to update details after copying of a course.
• [X] Added permission for non-admins to update the copied course.
• [X] Added Tests.

Screenshots

Before:

After:

[ragesoss]

This works smoothly. The areas I noticed for improve the UX are:

• it should handle course URLs that include a suffix, like https://dashboard.wikiedu.org/courses/Santa_Clara_University/Critical_Thinking_and_Writing_2_Honors_(Spring)/home
• it should automatically work around duplicate slugs without showing an error.
• it should keep all the dates in the form, and not require any other changes (like setting/unsetting meeting days) in order to save from the copy form.