Delete an environment via UI

What does this MR do?

This MR adds a button to delete stopped environments at these two "Operations" endpoints:

List ("Stopped" Tab)	/environments/:environment_id?scope=stopped
Detail	/environments/:environment_id

The "Delete" button is only visible on the "Detail" page when an environment is stopped. In all cases, after the "Delete" button is clicked a modal is displayed for the user to confirm or cancel the deletion.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry for user-facing changes, or community contribution. Check the link for other scenarios.
• Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides

Performance and testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Closes #41845 (moved)