SecretsManager: Introduce worker and secret async service (#107614)

SecretsManager: Introduce worker and secret aysnc service

Co-authored-by: PoorlyDefinedBehaviour <brunotj2015@hotmail.com>
Co-authored-by: Matheus Macabu <macabu@users.noreply.github.com>
Co-authored-by: Michael Mandrus <michael.mandrus@grafana.com>

pkg/storage/secret/metadata/outbox_store.go

@@ -52,7 +52,6 @@ type outboxMessageDB struct {
 }
 
 func (s *outboxStore) Append(ctx context.Context, input contracts.AppendOutboxMessage) (messageID int64, err error) {
-	start := time.Now()
 	ctx, span := s.tracer.Start(ctx, "outboxStore.Append", trace.WithAttributes(
 		attribute.String("name", input.Name),
 		attribute.String("namespace", input.Namespace),
@@ -74,6 +73,7 @@ func (s *outboxStore) Append(ctx context.Context, input contracts.AppendOutboxMe
 
 	assert.True(input.Type != "", "outboxStore.Append: outbox message type is required")
 
+	start := time.Now()
 	messageID, err = s.insertMessage(ctx, input)
 	if err != nil {
 		return messageID, fmt.Errorf("inserting message into outbox table: %+w", err)
@@ -156,7 +156,6 @@ func (s *outboxStore) insertMessage(ctx context.Context, input contracts.AppendO
 }
 
 func (s *outboxStore) ReceiveN(ctx context.Context, limit uint) ([]contracts.OutboxMessage, error) {
-	start := time.Now()
 	messageIDs, err := s.fetchMessageIdsInQueue(ctx, limit)
 	if err != nil {
 		return nil, fmt.Errorf("fetching message ids from queue: %w", err)
@@ -170,6 +169,7 @@ func (s *outboxStore) ReceiveN(ctx context.Context, limit uint) ([]contracts.Out
 		MessageIDs:  messageIDs,
 	}
 
+	start := time.Now()
 	query, err := sqltemplate.Execute(sqlSecureValueOutboxReceiveN, req)
 	if err != nil {
 		return nil, fmt.Errorf("execute template %q: %w", sqlSecureValueOutboxReceiveN.Name(), err)