Migrate CG to platform

The "platform" part of Harness gets installed no matter what. In the current iteration of the chart, those pieces are installed as sub charts. Migrate all components in the cg folder into sub charts to ensure that they always get installed. As part of this work, the harness-verification-svc and learning-engine components can be removed from the Chart.

Acceptance Criteria

• Move components out of chart/templates/cg/ and into their own respective subchart
• Delete the harness-verification-svc and learning-engine components as part of the move
• Delete the cg folder once all components are moved
• Test that deployments still work
• Submit MR