[Bug Fix]: Resolves Internal Server Error Triggered by Testset Removal in Evaluation Page

[aybruhm]

Description

This PR achieves the following:

• Creates a dummy app and testset (not visible to users)
• Loads the dummy testset at application restart
• Implements backend logic to assign the dummy test set to evaluations (in use)
• Utilizes alertPopup component to remove testset(s) in the UI, etc

Related Issue

Closes #863 x #1005

[aybruhm]

@bekossy could you help run prettier, commit and push? Thank you.

[aakrem]

@aybruhm could this create a conflict with the default testsets ?

[aybruhm]

@aybruhm could this create a conflict with the default testsets ?

No, it will not.

[aakrem]

@aybruhm

• I would also give the option to delete the corresponding evaluations.
• The modal text should be improved to better mention that the evaluation will be referenced to an empty testset instead of dummy.

Approving for now. Please consider improving these two points.

[aakrem]

getting internal server error when deleting the testset

[aakrem]

closing this as, as agreed, we want to prevent deleting a testset instead of creating dummy one.
Re-open if needed