Update guide - GCP project import

[rajlearner17]

Guide to be updated
Provide the title or URL of the existing guide that needs to be updated.

Update GCP project import /guardrails/docs/guides/gcp/import-gcp-project guide to latest format

Reason for update
Explain why this guide needs to be updated (e.g., outdated information, missing content, unclear explanations).

Proposed changes
Describe the specific changes or additions you're suggesting for the guide. Be as detailed as possible.

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[github-actions]

This issue was closed because it has been stalled for 90 days with no activity.

[github-actions]

This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 30 days.