R1:99718b61d8f3

Fill in new URI credential edit web UI interfaces

Summary:
Ref T10748. Ref T10366. Allows users to set credential for new URIs.

- Ref T7221. Our handling of the "git://" protocol is currently incorrect. This protocol is not authenticated, but is considered an SSH protocol. In the new UI, it is considered an anonymous/unauthenticated protocol instead.
- Ref T10241. This fixes the `PassphraseCredentialControl` so it doesn't silently edit the value if the current value is not visible to you and/or not…