Update group project removals to use a confirm delete modal

Problem to solve

Removing a project in Groups > Settings > Projects pops up a basic confirmation modal.

This doesn't conform with other project deletion processes that uses a delete confirmation modal.

The Groups > Settings > Projects modal doesn't use danger colours to indicate a destructive action.

Screenshots

Group / Projects	Project / Settings

Group->Settings->Project

Group->Settings->General->Delete

Proposal

Change the Groups > Settings > Projects to use the modal that was added in !36962 (merged) for Project > Settings.

Engineering guide

1. Mount app/assets/javascripts/projects/components/shared/delete_button.vue as the delete button