fix(eventstore): use decimal, correct mirror (#9914)

# Eventstore fixes

- `event.Position` used float64 before which can lead to [precision
loss](https://github.com/golang/go/issues/47300). The type got replaced
by [a type without precision
loss](https://github.com/jackc/pgx-shopspring-decimal)
- the handler reported the wrong error if the current state was updated
and therefore took longer to retry failed events.

# Mirror fixes

- max age of auth requests can be configured to speed up copying data
from `auth.auth_requests` table. Auth requests last updated before the
set age will be ignored. Default is 1 month
- notification projections are skipped because notifications should be
sent by the source system. The projections are set to the latest
position
- ensure that mirror can be executed multiple times

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>

internal/eventstore/repository/sql/postgres_test.go

@@ -4,6 +4,8 @@ import (
 	"database/sql"
 	"testing"
 
+	"github.com/shopspring/decimal"
+
 	"github.com/zitadel/zitadel/internal/eventstore"
 	"github.com/zitadel/zitadel/internal/eventstore/repository"
 )
@@ -312,7 +314,7 @@ func generateEvent(t *testing.T, aggregateID string, opts ...func(*repository.Ev
 		ResourceOwner: sql.NullString{String: "ro", Valid: true},
 		Typ:           "test.created",
 		Version:       "v1",
-		Pos:           42,
+		Pos:           decimal.NewFromInt(42),
 	}
 
 	for _, opt := range opts {