[SPC] Block SPC if using credential store APIs and they're not available

This CL adds a new method to InternalAuthenticator, to return whether or
not GetMatchingCredentialIds is currently supported. If the
base::Feature flag is set to use the credential store, but
GetMatchingCredentialIds is not supported, SPC will no longer be
available as a payment method.

This allows websites to avoid the case where a user runs Chrome with the
flag enabled (or default-on, in some future release), but with an old
version of GMSCore that does not support the functionality.

Bug: 1365982
Change-Id: I0c39dcd6184683ed976bfa4ba8a31dcdaa4e9e62
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3910109
Commit-Queue: Jared Saul <jsaul@google.com>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Auto-Submit: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Jared Saul <jsaul@google.com>
Cr-Commit-Position: refs/heads/main@{#1052153}