Quiz exercises: Export images of quiz exercises

[EneaGore]

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.

Client

• Important: I implemented the changes with a very good performance, prevented too many (unnecessary) REST calls and made sure the UI is responsive, even with large data.
• I strictly followed the client coding and design guidelines.
  Following the theming guidelines, I specified colors only in the theming variable files and checked that the changes look consistent in both the light and the dark theme.
• I added multiple integration tests (Jest) related to the features (with a high test coverage), while following the test guidelines.
  I added authorities to all new routes and checked the course groups for displaying navigation elements (links, buttons).
• I documented the TypeScript code using JSDoc style.
• I added multiple screenshots/screencasts of my UI changes.
  I translated all newly inserted strings into English and German.

Motivation and Context

When a quiz is deleted, so are the assets. A previously imported json file of a quiz can no longer be used to import that quiz. This PR exports assets(images) in a zip file.
Adress issue 7682
At the moment importing a quiz through a json file does not work if the images have been deleted. A follow up PR will allow to import the quiz with the exported zip folder and a json file.

Description

For drag and drop questions the background and drag items are pulled and zipped. For images embedded in the text/MC Options a regex expression fetches the file name and path and zips the image.

Steps for Testing

Prerequisites:

• 1 Instructor
• 1 quiz

1. Log in to Artemis
2. Create a Quiz with different type of questions
3. Add image in the text/ MC Options / Drag and Drop questions etc.
4. Export quiz
5. If there are no images a single json file of the quiz structure is downloaded
6. If there are images, a zip file with the images and a json file of the quiz structure is downloaded

Testserver States

Note

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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
• I (as a reviewer) 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

Test Coverage

Class/File	Line Coverage	Confirmation (assert/expect)
quiz-exercise.service.ts	96.19%	✅

Screenshots

Summary by CodeRabbit

• New Features

  • Enhanced quiz export functionality to include images in markdown and assets from drag-and-drop exercises.
  • Added the ability to download a ZIP file containing exported quiz assets.

• Tests

  • Introduced new test cases to verify the export of images and assets from various quiz question types.

[coolchock]

re-approve

[kaancayli]

Reapprove

[undernagruzez]

re approve

[FelixTJDietrich]

Tested on TS6 and it is now one zip containing everything. Code changes also look good

[marlon-luca-bu]

Changes look good to me