Theia 18 hotfixes (#528)

* Restore monaco suggestion highlights

* remove duplicated tabs on startup

* fix rename and delete sketch

* remove '.only(...)' in tests

Co-authored-by: Alberto Iannaccone <a.iannaccone@arduino.cc>

arduino-ide-extension/src/test/browser/monitor-utils.test.ts

@@ -125,7 +125,7 @@ testLines.forEach((t) =>
   )
 );
 
-describe.only('Monitor Utils', () => {
+describe('Monitor Utils', () => {
   beforeEach(() => {
     set(date);
   });