[ledger auth] Add new metric for ledger firebase auth errors.
Ledger authentication is moving to a new auth service provided at
As a result, the error codes are different. During the migration and
rollback, both metrics are used and could overlap. So, to keep the
error buckets separate for each flow, creating a new metric id 4. Once
the new flow is in full use, we will get rid of the old metric id 3.
TEST = CQ
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