Revert "MB-65014 Move SetActiveEncryptionKeysTask back to NonIO thread pool"

This reverts commit 2ee437a.

Reason for revert: Magma reverted the change to wait for IO

Change-Id: I76f5356ff19c577e10ebb2735b2e888d0463d11d
Reviewed-on: https://review.couchbase.org/c/kv_engine/+/224457
Tested-by: Trond Norbye <trond.norbye@couchbase.com>
Reviewed-by: Trond Norbye <trond.norbye@couchbase.com>

Author: trondn

executor/tasks.def.h

@@ -58,6 +58,7 @@ TASK(Core_RbacReloadTask, TaskType::Reader, 0)
 TASK(Core_CreateBucketTask, TaskType::AuxIO, 0)
 TASK(Core_DeleteBucketTask, TaskType::AuxIO, 0)
 TASK(Core_SettingsReloadTask, TaskType::AuxIO, 0)
+TASK(Core_SetActiveEncryptionKeysTask, TaskType::AuxIO, 2)
 TASK(Core_PruneEncryptionKeysTask, TaskType::AuxIO, 2)
 TASK(Core_StatsBucketAuxIoTask, TaskType::AuxIO, 1)
 TASK(VBucketMemoryAndDiskDeletionTask, TaskType::AuxIO, 0)
@@ -122,6 +123,5 @@ TASK(Core_PushClustermapTask, TaskType::NonIO, 10)
 TASK(Core_SaslStartTask, TaskType::NonIO, 10)
 TASK(Core_SaslStepTask, TaskType::NonIO, 10)
 TASK(Core_Ifconfig, TaskType::NonIO, 10)
-TASK(Core_SetActiveEncryptionKeysTask, TaskType::NonIO, 10)
 TASK(SeqnoPersistenceNotifyTask, TaskType::NonIO, 1)
 TASK(InitialMFUTask, TaskType::NonIO, 20)