Auth device deletion wizard

[bl-nero]

This change replaces the old verification and device deletion dialogs on the account settings page.

Figma: https://www.figma.com/design/8DQZl1mYUPLgvKgmA6zPOM/In-Progress-Work?node-id=7085-45338&m=dev

Deviations from design:

• The design didn't take the verification step into consideration, I had to get creative and make it consistent with the existing patterns.

Demo: https://us02web.zoom.us/clips/share/YOlFNDEJocRuuldA-gXOmZYHvuVL74i7a-9VEdEnCgyYXCqAifTUfUWFiV-3n8kiPc-uAIKiWcp8LD235t4VxMum.0AtdxTnxTZX3Jg0z

Closes #37622

[bl-nero]

Note to the reviewers: I did some basic manual testing, but I still need to give it a thorough beating. I'll do it once I get some sleep; stay tuned.

[bl-nero]

How embarassing, I ran into an ugly conflict with my own code and had to do a lot of post-merge fixes.

[bl-nero]

Tested cases:

• Adding methods:
  • Adding a passkey
  • Adding an authenticator app, MFA key verification
  • Adding an MFA key, auth app verification
  • Adding an auth method, having only a WebAuthn key
  • Adding an auth method, having only an authenticator app
  • Adding an auth method, having no relevant verification method set up
• Deleting methods:
  • Deleting a passkey
  • Deleting the last passkey
  • Deleting an MFA key, MFA verification
  • Deleting an authenticator app, auth app verification
  • Deleting the last MFA method, no passkey
  • Deleting an auth method, having only a WebAuthn key
  • Deleting an auth method, having only an authenticator app

[public-teleport-github-review-bot]

@bl-nero See the table below for backport results.

Branch	Result
branch/v15	Failed