refactor: remove unused provider files and clean up apply selector logic

- Deleted unused provider files for Deployment, Environment, JobAgent, Policy, and System to streamline the codebase.
- Updated applySelectorToSpecs function to remove references to deleted spec types, simplifying the logic for applying metadata to ResourceItemSpec only.
- Enhanced code clarity by removing commented-out code and unnecessary cases in the switch statement.

Author: jsbroks

cmd/ctrlc/root/apply/selector.go

@@ -9,14 +9,8 @@ func applySelectorToSpecs(selector *providers.Selector, specs []providers.TypedS
 
 	for _, spec := range specs {
 		switch typed := spec.Spec.(type) {
-		case *providers.JobAgentSpec:
-			typed.Metadata = selector.ApplyMetadata(typed.Metadata)
 		case *providers.ResourceItemSpec:
 			typed.Metadata = selector.ApplyMetadata(typed.Metadata)
-		case *providers.DeploymentSpec:
-			typed.Metadata = selector.ApplyMetadata(typed.Metadata)
-		case *providers.PolicySpec:
-			typed.Metadata = selector.ApplyMetadata(typed.Metadata)
 		}
 	}
 }