[Meta] Move GCS input/integration to GA

[narph]

Integration release checklist

This checklist is intended for integrations maintainers to ensure consistency
when creating or updating a Package, Module or Dataset for an Integration.

All changes

• Change follows the contributing guidelines
• Supported versions of the monitoring target are documented
• Supported operating systems are documented (if applicable)
• Integration or System tests exist
• Documentation exists, useful guidelines to follow
• Fields follow ECS and naming conventions
• At least a manual test with ES / Kibana / Agent has been performed.
• Required Kibana version set to: 8.11

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)