chore: remove unload event from OTLPExporterBrowserBase

experimental/packages/otlp-exporter-base/src/platform/browser/OTLPExporterBrowserBase.ts

@@ -52,14 +52,6 @@ export abstract class OTLPExporterBrowserBase<
     }
   }
 
-  onInit(): void {
-    _globalThis.addEventListener('unload', this.shutdown);
-  }
-
-  onShutdown(): void {
-    _globalThis.removeEventListener('unload', this.shutdown);
-  }
-
   send(
     items: ExportItem[],
     onSuccess: () => void,