test: remove 'remote' usage from process tests (#20418)

spec/static/main.js

@@ -42,6 +42,8 @@ ipcMain.on('message', function (event, ...args) {
   event.sender.send('message', ...args)
 })
 
+ipcMain.handle('get-temp-dir', () => app.getPath('temp'))
+
 // Set productName so getUploadedReports() uses the right directory in specs
 if (process.platform !== 'darwin') {
   crashReporter.productName = 'Zombies'