[Uno-D] Record signin offered histograms for uno related access points

Record `Signin.SignIn.Offered` for the ProfileMenu and password bubble
entry point, for all states except SigninPending.

Extended existing histogram `Signin.SignIn.Offered` to have variants
for `.WithDefault` and `.NewAccountNoExistingAccount`.
`.WithDefault`: defaulted web signed in account.
`.NewAccountNoExistingAccount`: fully signed out users.

Bug: b:369834715
Change-Id: Ica4ef81c4d259f3e8501bf5e7d7b293ce6c4a568
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5993556
Commit-Queue: Ryan Sultanem <rsult@google.com>
Reviewed-by: David Roger <droger@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1380360}