Reland "[Mac SSO]Extract entra sso and add tests"

Still experimental, the failing test was disabled for now.

This is a reland of commit b790fb19d8a0aa08caa2676dd93c95fd77b1b875

Original change's description:
> [Mac SSO]Extract entra sso and add tests
>
> Create a SSOServiceEntraAuthControllerDelegate to handle entra specific
> entra sso things, such as create a request with the right params and
> handling the response.
>
> Added unit tests to verify the handling of sample response from the OS.
> Added browser tests to ensure that failure cases are well handled;
> success cases are harder to test so they are currently missing and need
> to be manually tested.
>
> Bug: 340868357
> Change-Id: I19a9f2c844fdb60f43409e55a5851d16c97e51c7
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6210417
> Commit-Queue: Yann Dago <ydago@chromium.org>
> Reviewed-by: Igor Ruvinov <igorruvinov@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#1415106}

Bug: 340868357
Change-Id: I6f7a7697f0c53a7c7c8f106bec78b50ef2fefaee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6226452
Reviewed-by: Igor Ruvinov <igorruvinov@chromium.org>
Commit-Queue: Igor Ruvinov <igorruvinov@chromium.org>
Auto-Submit: Yann Dago <ydago@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1416860}