Iris: Get offered models from Pyris

[SolizerCodes]

Checklist

General

• I tested all changes and their related features with all corresponding user types 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.

Server

• Important: I implemented the changes with a very good performance and prevented too many (unnecessary) database calls.
• I followed the coding and design guidelines.
• I added pre-authorization annotations according to the guidelines and checked the course groups for all new REST Calls (security).
• I documented the Java code using JavaDoc style.

Motivation, Context and Description

Since introducing a health endpoint to Pyris, we also want to provide a dynamic model list provided by Pyris.
Available models can be fetched through a newly created endpoint.
It is connected to ls1intum/Pyris#12

Steps for Testing

Go to the global/course/exercise settings and observe the new dropdown, which fetches its data from Pyris. (Only works if ls1intum/Pyris#12 is deployed as well)

Review Progress

Performance Review

• I confirm that the server changes (in particular related to database calls) are implemented with a very good performance

Code Review

• Code Review 1
• Code Review 2

Manual Tests

• Test 1
• Test 2

Screenshots

[SolizerCodes]

I tested the server stuff together with my server stuff and it works for me. The only problem I had was with the model that was selected globally. The model could not give me a response

[SabrinaGlatz]

Tested on ts9 with all models, works as expected.

[DemjenDavid]

Tested on ts9