Do not export NamedLocal as it is never imported.

There's a linting check that fails if we export something without
importing it anywhere.

extensions/ql-vscode/src/log-insights/log-summary.ts

@@ -63,7 +63,7 @@ export interface InLayer extends ResultEventBase {
   predicateIterationMillis: number[];
 }
 
-export interface NamedLocal extends ResultEventBase {
+interface NamedLocal extends ResultEventBase {
   evaluationStrategy: "NAMED_LOCAL";
   deltaSizes: number[];
   ra: Ra;