Refactor API route setup in gitops.go for improved organization and clarity (#933)

- Introduced SetupAllRoutes function to initialize all API routes.
- Organized routes into dedicated setup functions: setupHealthRoutes, setupGitopsRoutes, setupHelmRoutes, setupGitHubRoutes, setupWebhookRoutes, and setupValidationRoutes.
- Enhanced GitOps routes with additional endpoints for deployment status, listing, and deletion.
- Consolidated Helm routes for deployment and retrieval under a single group.
- Added GitHub deployment routes with specific handlers for listing, retrieving, and deleting deployments.
- Implemented webhook configuration routes with Redis integration for storing and retrieving settings.
- Established validation routes for testing repository access and Kubernetes connectivity.
- Created a combined deployment history endpoint to retrieve GitHub, Helm, and manifests data in a single response.

Author: Sahelisaha04