Add 'Connect to cloud services' to global navigation.

• Link to the merge request of the new page:

• Give the MR a descriptive title.

• Link to the merge request that introduced the new page.

Menu Outline

• Connect to cloud services
  • Configure OpenID Connect in AWS
  • Configure OpenID Connect in GCP (Future)
  • Configure OpenID Connect in Vault (Future)

Dependent on: gitlab!77125 (merged), gitlab!77127 (merged),