Clean up GCP Cloud Workstations privilege escalation doc

Removed introductory content and references related to Cloud Workstations.

Author: AI-redteam

src/pentesting-cloud/gcp-security/gcp-privilege-escalation/gcp-cloud-workstations-privesc.md

@@ -1,14 +1,5 @@
 # GCP - Cloud Workstations Privesc
 
-{{#include ../../../banners/hacktricks-training.md}}
-
-## Cloud Workstations
-
-For more information about Cloud Workstations check:
-
-{{#ref}}
-../gcp-services/gcp-cloud-workstations-enum.md
-{{#endref}}
 
 ### Container Breakout via Docker Socket (Container -> VM -> Project)