Fix duplicate mock warning

Signed-off-by: Sebastian Malton <sebastian@malton.name>

src/jest.setup.ts

@@ -44,6 +44,8 @@ global.ResizeObserver = class {
 jest.mock("./renderer/components/monaco-editor/monaco-editor");
 jest.mock("./renderer/components/tooltip/withTooltip");
 
+jest.mock("monaco-editor");
+
 const getInjectables = (environment: "renderer" | "main", filePathGlob: string) => [
   ...glob.sync(`./{common,extensions,${environment}}/**/${filePathGlob}`, {
     cwd: __dirname,