Remove typecasting for factories

To produce valid history items and have them blow up when we need to
add new fields.

Author: elenatanasoiu

extensions/ql-vscode/src/vscode-tests/factories/remote-queries/remote-query-history-item.ts

@@ -37,5 +37,5 @@ export function createMockRemoteQueryHistoryItem({
       repositoryCount,
     },
     userSpecifiedLabel,
-  } as unknown) as RemoteQueryHistoryItem;
+  });
 }

extensions/ql-vscode/src/vscode-tests/factories/remote-queries/variant-analysis-history-item.ts

@@ -18,6 +18,6 @@ export function createMockVariantAnalysisHistoryItem(
     completed: false,
     variantAnalysis: createMockVariantAnalysis(variantAnalysisStatus),
     userSpecifiedLabel,
-  } as unknown) as VariantAnalysisHistoryItem;
+  });
 }