refactor(core,platform-fastify): drop useless optional signature

Author: micalevisk

packages/core/test/utils/noop-adapter.spec.ts

@@ -21,9 +21,9 @@ export class NoopHttpAdapter extends AbstractHttpAdapter {
   setErrorHandler(handler: Function, prefix = '/'): any {}
   setNotFoundHandler(handler: Function, prefix = '/'): any {}
   isHeadersSent(response: any): any {}
-  getHeader?(response: any, name: string) {}
+  getHeader(response: any, name: string) {}
   setHeader(response: any, name: string, value: string): any {}
-  appendHeader?(response: any, name: string, value: string) {}
+  appendHeader(response: any, name: string, value: string) {}
   registerParserMiddleware(): any {}
   enableCors(options: any): any {}
   createMiddlewareFactory(requestMethod: RequestMethod): any {}

packages/platform-fastify/adapters/fastify-adapter.ts

@@ -525,15 +525,15 @@ export class FastifyAdapter<
     return response.sent;
   }
 
-  public getHeader?(response: any, name: string) {
+  public getHeader(response: any, name: string) {
     return response.getHeader(name);
   }
 
   public setHeader(response: TReply, name: string, value: string) {
     return response.header(name, value);
   }
 
-  public appendHeader?(response: any, name: string, value: string) {
+  public appendHeader(response: any, name: string, value: string) {
     response.header(name, value);
   }