Lectures: Show slide numbers to be removed in automatic unit processing

[rstief]

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 multiple integration tests (Spring) related to the features (with a high test coverage).
• 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.

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 followed the coding and design guidelines.
• I added multiple integration tests (Jest) related to the features (with a high test coverage), while following the test guidelines.
• 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

Solves Issue #6896

Description

When adding attachment units to a lecture via automatic lecture processing, users can remove slides with certain keywords (e.g. "Break"). This PR adds the functionality that when the user searches for keywords, the slides that will be removed get displayed.

Steps for Testing

1. Log in as an Editor/Instructor
2. Go to any course -> manage -> lectures
3. Create a new lecture or edit an existing one
4. Tick the checkbox automatic unit processing
5. Upload a .pdf file (Here is an Example.pdf)
6. Click on Process units
7. (Optional) split the file into more than the units that already exist
8. Enter keyphrases, seperated by commas (e.g. "Break, Example Solution")
9. Observe that the textbox above gets updated with the slide numbers that get removed
10. Observe that empty keyphrases (e.g. " ", "ValidKeyphrase, ") don't get evaluated (For the latter "Valid Keyphrase gets evaluated but the empty keyphrase after it will not)
11. Click on save and verify that the generated units are correct

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

Client

Class/File	Line Coverage	Confirmation (assert/expect)
attachment-units.component.ts	90.56%	✅
attachmentUnit.service.ts	100%	✅

Server

Class/File	Line Coverage	Confirmation (assert/expect)
LectureUnitProcessingService.java	93%	✅
AttachmentUnitResource.java	92%	✅

Screenshots

[jakubriegel]

Tested on ts1, works fine

[basak-akan]

Tested during testing session, worked well

[github-actions]

❌ Unable to deploy to test servers ❌

The docker build needs to run through before deploying.

[lennart-keller]

Retested locally. Works fine

resolved issues

[egekurt123]

tested on ts1 in testing session. Works as expected

[max-bergmann]

Tested in Testing session on TS3 - LGTM

[MaximilianAnzinger]

Tested during testing session

[vinceclifford]

Works as expected

[MaximilianAnzinger]

Code LGTM

[Strohgelaender]

code