Usability: Add privacy checkbox to application form

[Abi107717]

Checklist

General

• I tested all changes and their related features with all corresponding user types.
• 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 (e.g. using paging).
• I strictly followed the client coding and design guidelines.
• I added multiple screenshots/screencasts of my UI changes.

Motivation and Context

Applicants need to explicitly confirm the privacy statement when submitting an application. This was already implemented for job creation, but not for applications. This PR introduces the missing privacy consent on Application Creation.

#510

Description

Added new privacy section at the bottom of application creation page 3

Steps for Testing

Prerequisites:

1. Log in to TumApply as an applicant
2. Start an application for a job.
3. Complete Page 1 and Page 2 with valid data.
4. On Page 3: Verify privacy section appears at the bottom
5. Leave checkbox unchecked, click Send, confirm in dialog and check if an Error message appears (under checkbox)
6. Check if there is a Toast: “Please confirm the privacy statement.”
7. Check the box and verify that the error disappears.
8. Click Send again → confirm in dialog → expect application is sent successfully.

Review Progress

Code Review

• Code Review 1

Manual Tests

• Test 1

Screenshots

[github-actions]

🚨 OpenAPI Validation Failed 🚨

The OpenAPI specs in openapi.yaml differ from the generated version.
Please update the OpenAPI specs by running:

cd .
./gradlew generateApiDocs -x webapp

Commit and push the updated file.