fix(eventstore): use decimal, correct mirror (#9916)

# 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

internal/v2/eventstore/query.go

@@ -7,6 +7,8 @@ import (
 	"slices"
 	"time"
 
+	"github.com/shopspring/decimal"
+
 	"github.com/zitadel/zitadel/internal/v2/database"
 )
 
@@ -723,7 +725,7 @@ func (pc *PositionCondition) Min() *GlobalPosition {
 // PositionGreater prepares the condition as follows
 // if inPositionOrder is set: position = AND in_tx_order > OR or position >
 // if inPositionOrder is NOT set: position >
-func PositionGreater(position float64, inPositionOrder uint32) paginationOpt {
+func PositionGreater(position decimal.Decimal, inPositionOrder uint32) paginationOpt {
 	return func(p *Pagination) {
 		p.ensurePosition()
 		p.position.min = &GlobalPosition{
@@ -743,7 +745,7 @@ func GlobalPositionGreater(position *GlobalPosition) paginationOpt {
 // PositionLess prepares the condition as follows
 // if inPositionOrder is set: position = AND in_tx_order > OR or position >
 // if inPositionOrder is NOT set: position >
-func PositionLess(position float64, inPositionOrder uint32) paginationOpt {
+func PositionLess(position decimal.Decimal, inPositionOrder uint32) paginationOpt {
 	return func(p *Pagination) {
 		p.ensurePosition()
 		p.position.max = &GlobalPosition{