refactor(handler): cache active instances (#9008)

# Which Problems Are Solved

Scheduled handlers use `eventstore.InstanceIDs` to get the all active
instances within a given timeframe. This function scrapes through all
events written within that time frame which can cause heavy load on the
database.

# How the Problems Are Solved

A new query cache `activeInstances` is introduced which caches the ids
of all instances queried by id or host within the configured timeframe.

# Additional Changes

- Changed `default.yaml`
  - Removed `HandleActiveInstances` from custom handler configs
- Added `MaxActiveInstances` to define the maximal amount of cached
instance ids
- fixed start-from-init and start-from-setup to start auth and admin
projections twice
- fixed org cache invalidation to use correct index

# Additional Context

- part of #8999

internal/query/projection/projection.go

@@ -99,14 +99,14 @@ var (
 
 func Create(ctx context.Context, sqlClient *database.DB, es handler.EventStore, config Config, keyEncryptionAlgorithm crypto.EncryptionAlgorithm, certEncryptionAlgorithm crypto.EncryptionAlgorithm, systemUsers map[string]*internal_authz.SystemAPIUser) error {
 	projectionConfig = handler.Config{
-		Client:                sqlClient,
-		Eventstore:            es,
-		BulkLimit:             uint16(config.BulkLimit),
-		RequeueEvery:          config.RequeueEvery,
-		HandleActiveInstances: config.HandleActiveInstances,
-		MaxFailureCount:       config.MaxFailureCount,
-		RetryFailedAfter:      config.RetryFailedAfter,
-		TransactionDuration:   config.TransactionDuration,
+		Client:              sqlClient,
+		Eventstore:          es,
+		BulkLimit:           uint16(config.BulkLimit),
+		RequeueEvery:        config.RequeueEvery,
+		MaxFailureCount:     config.MaxFailureCount,
+		RetryFailedAfter:    config.RetryFailedAfter,
+		TransactionDuration: config.TransactionDuration,
+		ActiveInstancer:     config.ActiveInstancer,
 	}
 
 	OrgProjection = newOrgProjection(ctx, applyCustomConfig(projectionConfig, config.Customizations["orgs"]))
@@ -223,9 +223,6 @@ func applyCustomConfig(config handler.Config, customConfig CustomConfig) handler
 	if customConfig.RetryFailedAfter != nil {
 		config.RetryFailedAfter = *customConfig.RetryFailedAfter
 	}
-	if customConfig.HandleActiveInstances != nil {
-		config.HandleActiveInstances = *customConfig.HandleActiveInstances
-	}
 	if customConfig.TransactionDuration != nil {
 		config.TransactionDuration = *customConfig.TransactionDuration
 	}