Supply authz ID in CAA rechecks (#8730)

This field was added in #7870 for the purpose of VA-level logging. But
it's only been populated in CAA calls during normal validation, not
during CAA rechecks. Populate it there as well, for the sake of
consistent log output.

Author: aarongable

ra/ra.go

@@ -770,6 +770,7 @@ func (ra *RegistrationAuthorityImpl) recheckCAA(ctx context.Context, authzs []*c
 				Identifier:       authz.Identifier.ToProto(),
 				ValidationMethod: method,
 				AccountURIID:     authz.RegistrationID,
+				AuthzID:          authz.ID,
 			})
 			if err != nil {
 				ra.log.AuditErr("Rechecking CAA", err, map[string]any{