Feat/3637/add apply button

[BenediktMehl]

Add an apply button when selecting maps

Closes: #3637

Description

Added a button below the map selection.
Removing and changing the selection state of maps is only applied, if user clicks the apply button.

Definition of Done

A PR is only ready for merge once all the following acceptance criteria are fulfilled:

• Changes have been manually tested
• All TODOs related to this PR have been closed
• There are automated tests for newly written code and bug fixes
• All bugs discovered while working on this PR have been submitted as issues (if not already an open issue)
• Documentation (GH-pages, analysis/visualization READMEs, parser READMEs, --help, etc.) has been updated (almost always necessary except for bug fixes)
• CHANGELOG.md has been updated

Screenshots or gifs

[IhsenBouallegue]

The code looks good, I just have a couple of suggestions that might make this more intuitive.

1. Gray out and disable the Apply button when there are no changes, enable it when there is. That makes it clear when something changed and you have to apply.
2. The text on hover of the delete button is Remove map even when the button is restoring it.
3. Instead of a + icon we can use an undo, maybe it's clearer that it undoes the "delete".

[sonarcloud]

Quality Gate passed for 'CodeCharta Visualization'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
96.9% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[sonarcloud]

Quality Gate passed for 'CodeCharta Analysis'

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud