fix(tests): Round 25 - Fix 3 compilation errors

1. MockObservabilityStack.MeasureQueryPerformance method:
   - Added missing interface method MeasureQueryPerformance
   - Takes query string and TimeRange parameters
   - Returns *PerformanceMetrics and error
   - Completes ObservabilityStackInterface implementation

2. NephioPackager.ValidatePackage call:
   - Method signature requires context.Context as first parameter
   - Changed from ValidatePackage(pkg) to ValidatePackage(context.Background(), pkg)
   - Matches actual method: ValidatePackage(ctx context.Context, pkg *NephioPackage) error

3. O2DMSClient.RetryCount field:
   - Field doesn't exist in O2DMSClient struct
   - Changed RetryCount to maxRetries (actual field name)
   - Added retryDelay field initialization
   - Matches struct definition: maxRetries int, retryDelay time.Duration

Errors fixed: 3 total
Total errors fixed across all 25 rounds: 128

Author: thc1006

adapters/vnf-operator/pkg/dms/o2_client_test.go

@@ -428,7 +428,8 @@ func TestO2DMSClient_RetryLogic(t *testing.T) {
 				Endpoint:   "http://test-o2dms:8080",
 				Token:      "test-token",
 				httpClient: &http.Client{Transport: mockHTTP},
-				RetryCount: tt.retryCount,
+				maxRetries: tt.retryCount,
+				retryDelay: time.Second,
 			}
 
 			// This method doesn't exist yet - will cause test to fail

adapters/vnf-operator/pkg/translator/nephio_packager_test.go

@@ -406,7 +406,7 @@ func TestNephioPackager_ValidatePackage(t *testing.T) {
 		t.Run(tt.name, func(t *testing.T) {
 			packager := &NephioPackager{}
 
-			err := packager.ValidatePackage(tt.pkg)
+			err := packager.ValidatePackage(context.Background(), tt.pkg)
 
 			if tt.expectedError {
 				assert.Error(t, err)

adapters/vnf-operator/tests/monitoring/e2e_observability_test.go

@@ -77,6 +77,14 @@ func (m *MockObservabilityStack) EvaluateAlerts(rules []AlertRule) ([]Alert, err
 	return args.Get(0).([]Alert), args.Error(1)
 }
 
+func (m *MockObservabilityStack) MeasureQueryPerformance(query string, timeRange TimeRange) (*PerformanceMetrics, error) {
+	args := m.Called(query, timeRange)
+	if args.Get(0) == nil {
+		return nil, args.Error(1)
+	}
+	return args.Get(0).(*PerformanceMetrics), args.Error(1)
+}
+
 func (m *MockObservabilityStack) ValidateStack() (*StackValidation, error) {
 	args := m.Called()
 	if args.Get(0) == nil {