UI: [VAULT-19982] confirm delete modal for namespaces

[kiannaquach]

Description
Setting a height using inline styles directly in the template causes Content Security Policy errors.

Content Security Policy errors from putting inline styles:

The bug:

A few solutions to possibly prevent the Content Security Policy error:
Solution 1:
Instead of calculating the height, set a fixed min-height and add class with that min-height style. See possible solution 1 here: f5b785e
Solution 2:
Add the height style directly using js instead of in our templates. I paired with Jordan a little bit on this and found that this will likely not cause Content Security Policy errors since ember-basic-dropdown does something similar and injects some styling and these styles are set after initial render. See possible solution 2 here: 5fa9b68

[zofskeez]

🎉

[github-actions]

Build Results:
All builds succeeded! ✅

[github-actions]

CI Results:
All Go tests succeeded! ✅