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/eventstore/handler/v2/field_handler.go

@@ -41,7 +41,6 @@ func NewFieldHandler(config *Config, name string, eventTypes map[eventstore.Aggr
 			bulkLimit:              config.BulkLimit,
 			eventTypes:             eventTypes,
 			requeueEvery:           config.RequeueEvery,
-			handleActiveInstances:  config.HandleActiveInstances,
 			now:                    time.Now,
 			maxFailureCount:        config.MaxFailureCount,
 			retryFailedAfter:       config.RetryFailedAfter,