fix: doc for gcp org level integration

[girish-cheedala]

• we will need additional permission ( on resources ) at org level for aggregation to happen.
• Add project Ids optional field to integration docs
• Add gcloud cmd for getting project list

[neo-by-projectdiscovery-dev]

Neo - PR Security Review

No security issues found

Highlights

• Updates GCP organization-level permission documentation to include resource-specific roles (Compute Viewer, DNS Reader, Storage Bucket Viewer, Cloud Run Viewer, Cloud Functions Viewer, Kubernetes Engine Viewer)
• Documents 10 total read-only roles required for organization-level GCP asset aggregation
• Uses placeholder values (YOUR_PROJECT_ID, YOUR_ORG_ID) instead of real credentials

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