Improve the process of deleting image tags
### Problem to solve
It can be difficult to delete image tags from the container registry UI. Following https://gitlab.com/gitlab-org/gitlab/-/issues/327693#note_632953808, this issue proposes improving the UX for deleting individual tags.
### Proposal
* User should be able to delete tags individually in the list/table view.
* The button with a trash bin icon should be replaced by a `more actions` dropdown button.
* ~"component:button" ellipsis https://design.gitlab.com/components/button/#ellipsis
* Clicking the `more action` button displays the *Delete tag* option.
* Clicking *Delete tag* triggers the existing flow for deleting an individual tag.
* Clicking anywhere outside the dropdown closes it.
issue