CATROID-1662 Let user revert project deletion

[hannesweilharter]

Currently, when a user accidentially deletes a project, there is no way to recover the deleted project.
This PR introduces an undo functionality for project deletions. They are tracked and can be reverted with an undo-button in the top menu bar, similar to the one that already exists for modifications inside a project or in the backpack. Initially only the last deleted project is tracked and can be reverted.

Implementation Details

• Before a project is deleted, its entire directory is copied into a dedicated hidden backup location (PROJECT_DELETION_UNDO_DIRECTORY).
• If the backup is created successfully, the original project is deleted as usual.
• The UI displays an Undoaction whenever a valid backup exists.
• Selecting Undo restores the project by copying the backup back into the projects directory.
• If another project with the same name already exists, a unique project name is generated automatically, and the project's metadata (code.xml) is updated accordingly.
• After a successful restore, the temporary backup is removed and the Undo option is hidden.

Testcases
added in DeleteProjectTest:

• deleteProjectShowUndoButtonTest
• undoDeletedProjectTest
• undoOptionNotVisibleAfterActivityChangeTest

Additionally, the file DeleteProjectTest was refactored to Kotlin.

https://catrobat.atlassian.net/browse/CATROID-1662

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screen_rec.webm

[harshsomankar123-tech]

@hannesweilharter Thanks for the feature! It would be great if you could also add a screencast of the feature

[sonarqubecloud]

Quality Gate passed

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 SonarQube Cloud

[harshsomankar123-tech]

@hannesweilharter Thanks! but i think we are discuss different approach to solve this problem from snackbar.
cc @reichli @wslany

[sonarqubecloud]

Quality Gate passed

Issues
2 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 SonarQube Cloud

[harshsomankar123-tech]

@hannesweilharter @wslany @reichli I’m not sure users will be aware of that redo feature.
Instead, I think adding a dialog would be better, as it follows common Android UI practices and would be more familiar and intuitive for users.

What do you think?