1177 course import deduplicate emails

[barisgul15]

Motivation and Context

Issue 1177: https://github.com/orgs/TUM-Dev/projects/10/views/1?pane=issue&itemId=41336294
The array coming from TUMonline has some duplicates in contacts and these need to be eliminated.

Description

The data coming from TUMonline sometimes duplicates contacts of some courses. course.contacts has 5 attributes:
first_name, last_name, email, main_contact, role.
All cases considered, the most distinctive among them is e-mail. So a script is added to modify the array before it is used for course contacts while importing courses.

Steps for Testing

Prerequisites:

• Having admin rights

1. Log in
2. Click admin in the menu
3. Click import courses
4. Find a course that used to have duplicate contacts: e.g. Einführung in die Games Eng(IN0031), IN2064, ...
5. Confirm that there are not duplicate contacts anymore.

Screenshots

Before there was two Vortragender, Leiterin, but the course has only one actually:

After the changes, the duplicate is eliminated:

[github-actions]

Your Testserver will be ready at https://1236.test.live.mm.rbg.tum.de in a few minutes.

Logins

Kurs1	Kurs2	Kurs3	Kurs4
public	public	loggedin	enrolled
prof1	prof1	prof2	prof1 prof2
student1 student2 student3	student1 student2	student2 student3	student1 student2

[SebiWrn]

Please move the script tag to the correct typescript files and use it from there

[barisgul15]

The location of the used filtering function is changed from course-import.gohtml to course-import.ts.

[SebiWrn]

I think there is still an issue with the checkboxes, because you just change the value in the contacts from your method, but the send mail method still uses the whole contact list without the updated values.
With that I think the checkboxes won't work and everybody will get an email even if you don't select them.

[SebiWrn]

If you still want to merge this PR please address the issues and reopen the PR