Address Go linter issues

Author: tjmoore4

internal/collector/postgres_metrics.go

@@ -256,7 +256,7 @@ func EnablePostgresMetrics(ctx context.Context, inCluster *v1beta1.PostgresClust
 // appendToJSONArray appends elements of a json.RawMessage containing an array
 // to another json.RawMessage containing an array.
 func appendToJSONArray(a1, a2 json.RawMessage) (json.RawMessage, error) {
-	var slc1 []json.RawMessage
+	var slc1 []json.RawMessage //nolint:prealloc // Populated by json.Unmarshal, not manual appends.
 	if err := json.Unmarshal(a1, &slc1); err != nil {
 		return nil, err
 	}

internal/controller/standalone_pgadmin/users.go

@@ -35,7 +35,6 @@ type pgAdminUserForJson struct {
 	IsAdmin bool `json:"isAdmin"`
 
 	// The user's password
-	//nolint:gosec // G117: This is a JSON serialization struct, not a hardcoded credential.
 	Password string `json:"password"`
 
 	// The username for User in pgAdmin.
@@ -332,6 +331,8 @@ cd $PGADMIN_DIR
 	// to add a user, that user will not be in intentUsers. If errors occurred when attempting to
 	// update a user, the user will be in intentUsers as it existed before. We now want to marshal the
 	// intentUsers to json and write the users.json file to the secret.
+
+	//nolint:gosec // G117: Password is intentionally stored in a Kubernetes Secret.
 	intentUserSecret.Data["users.json"], _ = json.Marshal(intentUsers)
 
 	err = errors.WithStack(r.setControllerReference(pgadmin, intentUserSecret))