Write e2e tests for registry deletion confirmation modal

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The following discussion from gitlab-ce!30161 should be addressed:

• @pgascouvaillancourt started a discussion: (+2 comments)

  Note: These test cases have been removed because it looks like bootrap-vue now appends modals to the body instead of rendering them in the component that uses them. We've decided to replace these tests with RSpec tests instead, which seems more appropriate in this context.