Development: Fix default URL for telemetry service

[b-fein]

Checklist

General

• I tested all changes and their related features with all corresponding user types on a test server.
• This is a small issue that I tested locally and was confirmed by another developer on a test server.
• Language: I followed the guidelines for inclusive, diversity-sensitive, and appreciative language.
• I chose a title conforming to the naming conventions for pull requests.

Motivation and Context

With the current default URL, the telemetry sending did not work:

artemis | 2024-09-28T16:08:58.749Z ERROR 1 --- [Artemis] [ artemis-task-1] .a.i.SimpleAsyncUncaughtExceptionHandler : Unexpected exception occurred invoking async method: public void de.tum.cit.aet.artemis.core.service.TelemetrySendingService.sendTelemetryByPostRequest() throws java.lang.Exception
artemis | 
artemis | java.lang.IllegalArgumentException: URI is not absolute
artemis | 	at java.base/java.net.URL.of(URL.java:862)
artemis | 	at java.base/java.net.URI.toURL(URI.java:1172)
artemis | 	at org.springframework.http.client.SimpleClientHttpRequestFactory.createRequest(SimpleClientHttpRequestFactory.java:154)

Description

Adds the https:// at the start to turn it into a proper URL.

Related PR: ls1intum/artemis-ansible-collection#102

Steps for Testing

Start a server in production config. It should not log the error above.

Testserver States

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Review Progress

Performance Review

• I (as a reviewer) confirm that the client changes (in particular related to REST calls and UI responsiveness) are implemented with a very good performance even for very large courses with more than 2000 students.
• I (as a reviewer) confirm that the server changes (in particular related to database calls) are implemented with a very good performance even for very large courses with more than 2000 students.

Code Review

• Code Review 1
• Code Review 2

Manual Tests

• Test 1
• Test 2

Test Coverage

unchanged

@coderabbitai ignore

[SimonEntholzer]

Tested locally, that fixes the issue.