Improve modal copy when deleting either the last or package files

Problem

When the user deletes all package files from a package, the modal copy is not very clear:

It may not be obvious to the user that deleting all files would delete the package.

Solution

Update the body copy of the modal

When the user deletes all files via a bulk delete action	When the user deletes the last file via individual delete action
Deleting the last package asset will remove version 0.0.0 of package name	Deleting all package assets will remove version 0.0.0 of package name

Update confirmation button of modal

Before	After
Delete	Permanently delete

Implementation guide

• Set text of modal based on condition https://gitlab.com/gitlab-org/gitlab/-/blob/master/app/assets/javascripts/packages_and_registries/package_registry/pages/details.vue#L234