Add confirmation modal when removing hero with saved builds

[jmferreirab]

Thank you for the pr @tyopoyt. Please try to add a description and/or visuals of the change to make the PR easier to review.

@fribbels I think this is a nice QoL. Useful when someone manages to accidentally hit remove hero on a hero they have a lot of builds. Likewise, it is not intrusive enough to be annoying since the extra confirmation is only being added to a rarely used button, similar to Github’s delete repository button.

Tested it myself and it's working fine.

[tyopoyt]

jmferreirab Ah yeah, I'll include more details in the pr body next time. I may have been somebody who managed to hit delete on a unit with builds I was working on 😅 Was trying to remove a build that I had ruled out