Fix that allows to --all-features and --exempt-features flags work together (#4149)

* Cover case when --all-features and --exempt-features flags are supplied.

* Added unit test.

* Sync with head

* Typo.

Author: bexxmodd

conformance/utils/suite/suite.go

@@ -206,7 +206,7 @@ func NewConformanceTestSuite(options ConformanceOptions) (*ConformanceTestSuite,
 	supportedFeatures := options.SupportedFeatures.Difference(options.ExemptFeatures)
 	source := supportedFeaturesSourceManual
 	if options.EnableAllSupportedFeatures {
-		supportedFeatures = features.SetsToNamesSet(features.AllFeatures)
+		supportedFeatures = features.SetsToNamesSet(features.AllFeatures).Difference(options.ExemptFeatures)
 	} else if shouldInferSupportedFeatures(&options) {
 		var err error
 		if options.GatewayClassName != "" {

conformance/utils/suite/suite_test.go

@@ -487,6 +487,13 @@ func TestInferGWCSupportedFeatures(t *testing.T) {
 				}),
 			},
 		},
+		{
+			name:             "all features combined with exempt features",
+			allowAllFeatures: true,
+			exemptFeatures:   sets.New[features.FeatureName]("ReferenceGrant", "HTTPRoute"),
+			expectedSource:   supportedFeaturesSourceManual,
+			expectedFeatures: features.SetsToNamesSet(features.AllFeatures).Difference(sets.New[features.FeatureName]("ReferenceGrant", "HTTPRoute")),
+		},
 	}
 
 	gwcName := "ochopintre"