Communication: Enable reactions if only messaging is enabled

[lennart-keller]

Checklist

General

• I tested all changes and their related features with all corresponding user types on a test server.
• This is a small issue that I tested locally and was confirmed by another developer 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).

Motivation and Context

Reactions only work if communication is enabled

Description

Reactions now also work, if only messaging is enabled.

Steps for Testing

Prerequisites:

• 1 Student
• 1 Instructor
• 1 Course with only messaging enabled

1. Check that you can react to messages and replies as both users and they get updated for the other user
2. Enable communication, disable messaging
3. Check that you can react to posts and replies as both users and reactions get updated for the other user

Review Progress

Performance Review

• 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

Screenshots

No UI changes

[rstief]

Tested on ts3, works well.

[MaximilianAnzinger]

Code lgtm

[Kroko-fant]

tested on ts looks good to me.
Code looks good to me

[Strohgelaender]

code

[Strohgelaender]

code + new tests lgtm

[lennart-keller]

Is fixed with #7437