Update minimal permission for open ports

[cblmemo]

#2210 introduces the function to open ports on cloud.

We need to add requested permission in our document for minimal permission for AWS/GCP, we probably should add another item about the permission for opening the ports. https://skypilot.readthedocs.io/en/latest/cloud-setup/cloud-permissions/gcp.html#user

For GCP, we don't have new permissions; For AWS, we need to add DeleteSecurityGroups.

[cblmemo]

Reference: https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DeleteSecurityGroup.html

[github-actions]

This issue is stale because it has been open 120 days with no activity. Remove stale label or comment or this will be closed in 10 days.

[cblmemo]

Closed since this issue has already been resolved in #2485