build dev build overwrite error

Summary:
some users and myself were facing a strange issue in development getting the error from esbuild

  errors: [
    {
      detail: undefined,
      id: '',
      location: null,
      notes: [],
      pluginName: '',
      text: 'Refusing to overwrite input file "../plugins/public/ui-debugger/dist/bundle.js" (use "allowOverwrite: true" to allow this)'
    }
  ],

the overwrite flag is set so its likley  a bug in a dependency somewhere, rather than chasign it down this seems to work

fixes https://fb.workplace.com/groups/flippersupport/permalink/1862902277523755/

Reviewed By: mweststrate

Differential Revision: D59145649

fbshipit-source-id: f795ad7bb20bff20fd3b9084fc31f6fa2e21b6bb

desktop/pkg-lib/src/runBuild.tsx

@@ -154,6 +154,8 @@ export default async function bundlePlugin(
 
   const bundleConfigs: RunBuildConfig[] = [];
 
+  await fs.remove(path.dirname(plugin.entry));
+
   await fs.ensureDir(path.dirname(plugin.entry));
   bundleConfigs.push({
     pluginDir,