Update Policy Enforcer Configuration Keys

- Changed configuration key from `policyDir` to `policyPaths` across multiple YAML files and related code to standardize the naming convention.
- Updated documentation to reflect the new key name and its usage for specifying local directories containing `.rego` policy files.
- Adjusted tests to ensure compatibility with the updated configuration structure.

pkg/plugin/implementation/policyenforcer/enforcer.go

@@ -24,7 +24,7 @@ func New(cfg map[string]string) (*PolicyEnforcer, error) {
 		return nil, fmt.Errorf("policyenforcer: config error: %w", err)
 	}
 
-	evaluator, err := NewEvaluator(config.PolicyDir, config.PolicyFile, config.PolicyUrls, config.Query, config.RuntimeConfig)
+	evaluator, err := NewEvaluator(config.PolicyPaths, config.PolicyFile, config.PolicyUrls, config.Query, config.RuntimeConfig)
 	if err != nil {
 		return nil, fmt.Errorf("policyenforcer: failed to initialize OPA evaluator: %w", err)
 	}