fix: Unify dialog style between test options and allowed hosts

[e-fisher]

Description

Use popover style dialog for allow list to match the style of test options. It also removes "save" and "discard" buttons from the allow list dialog to match other forms. The changes are reflected immediately without closing dialog.

How to Test

• Verify dialog is automatically opened for new recordings
• Verify dialog is opened when switching to recording with additional hosts or different hosts
• Try to add/remove hosts, switch static assets

Checklist

• I have performed a self-review of my code.
• I have added tests for my changes.
• I have run linter locally (npm run lint) and all checks pass.
• I have run tests locally (npm test) and all tests pass.
• I have commented on my code, particularly in hard-to-understand areas.

Screenshots (if appropriate):

Related PR(s)/Issue(s)

[going-confetti]

Looks great!

[cristianoventura]

LGTM! 🙌