Fix the export on TestServerHostCreationParameters to fix build break after LKG

Its not detected currently is because LKG doesnt have #32156

Author: sheetalkamat

src/harness/virtualFileSystemWithWatch.ts

@@ -30,7 +30,7 @@ interface Array<T> {}`
         return combinePaths(getDirectoryPath(libFile.path), "tsc.js");
     }
 
-    interface TestServerHostCreationParameters {
+    export interface TestServerHostCreationParameters {
         useCaseSensitiveFileNames?: boolean;
         executingFilePath?: string;
         currentDirectory?: string;