[DOCS-13481] GCP support for Cloudcraft in Datadog

[git-thuerk-done]

Fixes DOCS-13481

Adds GCP support documentation to the Cloudcraft in Datadog pages, and updates screenshots and videos across the section.

Content changes:

• _index.md: Adds a GCP tab to the Prerequisites section with steps to enable resource collection via the Google Cloud integration tile. Updates the Getting started tip to note that the Project dropdown lists GCP project IDs. Updates the Group by tags note to include GCP labels (for example, Project). Updates the overview video to show the GCP tab.
• overlays/infrastructure.md: Adds a provider comparison table for resource grouping hierarchy (Account/Subscription/Project, Region, VPC). Adds a note on GCP-specific additional grouping options (Firewall, Service, Subnet, Tags). Adds a GCP section to the excluded components list.
  • overlays/security.md: Adds a note that sensitive data is available for AWS accounts only.
  • overlays/observability.md: Adds a note that the Observability overlay is not available for GCP accounts.
  • overlays/ccm.md: Adds a note that the Cost view is not available for GCP accounts, but the Recommendations view is supported.

Screenshot and video updates:

• Replaces screenshots and videos across the section with updated versions. Several existing screenshots have been cropped to remove the provider and overlay selector headers. This reduces overhead when replacing screenshots in the future, since those UI elements are likely to change as new providers and overlays are added.

What does this PR do? What is the motivation?

Merge instructions

Merge readiness:

• Ready for merge

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Additional notes

[github-actions]

Preview links (active after the build_preview check completes)

Modified Files

• https://docs-staging.datadoghq.com/aliciathuerk/DOCS-13481-cloudcraft-gcp-support/datadog_cloudcraft/
• https://docs-staging.datadoghq.com/aliciathuerk/DOCS-13481-cloudcraft-gcp-support/datadog_cloudcraft/overlays/ccm
• https://docs-staging.datadoghq.com/aliciathuerk/DOCS-13481-cloudcraft-gcp-support/datadog_cloudcraft/overlays/infrastructure
• https://docs-staging.datadoghq.com/aliciathuerk/DOCS-13481-cloudcraft-gcp-support/datadog_cloudcraft/overlays/observability
• https://docs-staging.datadoghq.com/aliciathuerk/DOCS-13481-cloudcraft-gcp-support/datadog_cloudcraft/overlays/security