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

cmd/start/start.go

@@ -405,6 +405,7 @@ func startAPIs(
 
 	config.Auth.Spooler.Client = dbClient
 	config.Auth.Spooler.Eventstore = eventstore
+	config.Auth.Spooler.ActiveInstancer = queries
 	authRepo, err := auth_es.Start(ctx, config.Auth, config.SystemDefaults, commands, queries, dbClient, eventstore, keys.OIDC, keys.User)
 	if err != nil {
 		return nil, fmt.Errorf("error starting auth repo: %w", err)
@@ -412,7 +413,8 @@ func startAPIs(
 
 	config.Admin.Spooler.Client = dbClient
 	config.Admin.Spooler.Eventstore = eventstore
-	err = admin_es.Start(ctx, config.Admin, store, dbClient)
+	config.Admin.Spooler.ActiveInstancer = queries
+	err = admin_es.Start(ctx, config.Admin, store, dbClient, queries)
 	if err != nil {
 		return nil, fmt.Errorf("error starting admin repo: %w", err)
 	}