Development: Delete old files properly when updating file submissions

[MarkusPaulsen]

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 documented the Java code using JavaDoc style.

Motivation and Context

The parameter fileUploadSubmission is currently getting used for getting the last submission in FileUploadSubmissionService. The data of this parameter is under the control of the user, which may pose certain risks.

Description

Instead of FileUploadSubmission fileUploadSubmission, we now use StudentParticipation participation for getting the last submission in FileUploadSubmissionService, as the data of this parameter is not under the control of the user.

Steps for Testing

We just want to make sure that I didn't accidentally break the implementation.

Prerequisites:

• 1 Instructor
• 1 Student

Fileupload Exercise (Instructor, Student):

1. Create a file upload exercise with a description. Upload an image to the description
2. Start the exercise, the image should show up properly as well as the rest of the description
3. Participate in the exercise
4. Upload another file
5. View/Download the image
6. No issues should occur

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

Test Coverage

[Strohgelaender]

The server style action is currently failing, please run spotlessApply to fix the reported issues.

executed spotlesss

[RY997]

Reapprove

[krusche]

Code looks good to me and makes sense 👍

[dearjasmina]

reapprove

[Strohgelaender]

code looks good.