[#1733] Add option to remove Court Mandates

[rhian-cs]

What github issue is this PR for, if any?

Resolves #1733

What changed, and why?

When implementing #1795 I added an option to add and edit Court Mandates in the CASA Case Edit page.
Now I've implemented a way to delete Court Mandates that have already been saved in the database.

• The saved court mandates in the CASA Case Edit page now have a (-) (minus) button beside them.
• Clicking on it will show a dialog box with the requested confirmation text
• Deviating a little bit from what was requested, instead of adding a "Remove" and a "Return" button I added a "Delete" and "Go back" button instead.
• Clicking in the "Go back" button or the X button will close the dialog box and do nothing.
• Clicking in the "Delete" button will send an AJAX request to the server to delete the specified Court Mandate
• Instead of showing a notice (which most likely would require the page to be reloaded) I opted for showing another dialog box showing success (or failure, in case of any errors)
• After that, the court mandate disappears from the edit page

To "delete" a court mandate that has not been saved yet, the process remains the same: just empty the field.

How will this affect user permissions?

• Volunteer permissions: Cannot delete court mandates
• Supervisor permissions: Can delete court mandates
• Admin permissions: Can delete court mandates

How is this tested? (please write tests!) 💖💪

Automated tests

Request specs

For each type of user in the system (volunteers, admins and supervisors) I tested:

• Whether or not they could actually delete a court mandate
• Correct reponse from the server

Frontend specs

• The delete button shows a dialog box
• Clicking "Delete" removes the court mandate from the page
• The "success" dialog box shows up
• Clicking on Update CASA Case works perfectly, without any errors

Manual testing

• Log-in as admin/supervisor
• Go to a CASA case, add some court mandates and click Update to save the data
• Click on the minus button
• Check if the dialog box shows up and displays the correct message and buttons
• Click on the "Delete" button
• Check if the success dialog box shows up
• Check if the court mandate is actually gone in the page
• Update the page, check if no errors occurred and if the court mandate is actually gone

Screenshots please :)

Overview

Dialog box

Success message

After deletion

Mobile view

Mobile view of the dialog box

Mobile view of the success dialog box

[Diego-Thomaz]

this let should be a subject

[Diego-Thomaz]

This logic is repeated in your tests. It'd be nice to avoid this repetition by using a trait within your factory.

[Diego-Thomaz]

This method should be private

[Diego-Thomaz]

LGTM.

[compwron]

Swal!

[compwron]

Nice :)
Yay tests!