[lib] Introduce canResolveKeyserverSessionInvalidation

Summary:
Previously, to figure out if it was possible to resolve a keyserver session invalidation, we were checking for the presence of the resolveInvalidatedCookie function.

That function was missing on web but present on native, since it required native credentials to work.

Now we can attempt resolution for any client that is usingCommServicesAccessToken, so we want to update the check. Instead of duplicating the code, I introduced a function to handle the check.

Depends on D10577

Test Plan: Will test this by triggering a session invalidation by deleting a cookie from the MariaDB database

Reviewers: inka, varun, tomek

Reviewed By: inka

Differential Revision: https://phab.comm.dev/D10578