Add structured reporting diff to ComputeNetworkEdgeSecurityService (#6756)

### BRIEF Change description

Fixes #6558

#### WHY do we need this change?

Add structured reporting diff to the controller in
`pkg/controller/direct/compute/networkedgesecurityservice_controller.go`.
The `structuredreporting.ReportDiff` should be used in the `Update`
method of the adapter to report which fields are being updated.
This helps in debugging reconciliation loops and provides better
visibility into what changed.

#### Special notes for your reviewer:

#### Does this PR add something which needs to be 'release noted'?
```release-note
NONE
```

#### Additional documentation e.g., references, usage docs, etc.:
```docs
NONE
```

#### Intended Milestone
- [ ] Reviewer tagged PR with the actual milestone.

### Tests you have done

- [ ] Run `make ready-pr` to ensure this PR is ready for review.
- [ ] Perform necessary E2E testing for changed resources.

Author: cheftako

pkg/controller/direct/compute/networkedgesecurityservice_controller.go

@@ -35,6 +35,7 @@ import (
 	"github.com/GoogleCloudPlatform/k8s-config-connector/pkg/controller/direct"
 	"github.com/GoogleCloudPlatform/k8s-config-connector/pkg/controller/direct/directbase"
 	"github.com/GoogleCloudPlatform/k8s-config-connector/pkg/controller/direct/registry"
+	"github.com/GoogleCloudPlatform/k8s-config-connector/pkg/structuredreporting"
 	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/klog/v2"
@@ -197,11 +198,15 @@ func (a *NetworkEdgeSecurityServiceAdapter) Update(ctx context.Context, updateOp
 	// An up-to-date fingerprint must be provided in order to patch
 	resource.Fingerprint = a.actual.Fingerprint
 
+	report := &structuredreporting.Diff{Object: updateOp.GetUnstructured()}
+
 	var paths []string
 	if !reflect.DeepEqual(resource.SecurityPolicy, a.actual.SecurityPolicy) {
+		report.AddField("security_policy", a.actual.SecurityPolicy, resource.SecurityPolicy)
 		paths = append(paths, "security_policy")
 	}
 	if !reflect.DeepEqual(resource.Description, a.actual.Description) {
+		report.AddField("description", a.actual.Description, resource.Description)
 		paths = append(paths, "description")
 	}
 
@@ -215,6 +220,8 @@ func (a *NetworkEdgeSecurityServiceAdapter) Update(ctx context.Context, updateOp
 		return updateOp.UpdateStatus(ctx, status, nil)
 	}
 
+	structuredreporting.ReportDiff(ctx, report)
+
 	// updateMask is a comma-separated list of fully qualified names of fields.
 	sort.Strings(paths)
 	updateMask := strings.Join(paths, ",")