Add e2e test for multiport InferencePool enhancement (kubernetes-sigs/gateway-api-inference-extension#1885)

* Add e2e test for multi-port InferencePool

* Make fixes based on reviewer feedback.

* Address reviewer feedback; remove unusued function

---------

Co-authored-by: Ryan Rosario <[email protected]>

Author: RyanRosario

test/e2e/epp/e2e_suite_test.go

@@ -267,6 +267,7 @@ func createMetricsRbac(testConfig *testutils.TestConfig, filePath string) {
 	for _, m := range inManifests {
 		outManifests = append(outManifests, strings.ReplaceAll(m, "$E2E_NS", testConfig.NsName))
 	}
+
 	ginkgo.By("Creating RBAC resources for scraping metrics from manifest: " + filePath)
 	testutils.CreateObjsFromYaml(testConfig, outManifests)
 
@@ -320,7 +321,9 @@ func createEnvoy(testConfig *testutils.TestConfig, filePath string) {
 
 // createInferExt creates the inference extension resources used for testing from the given filePath.
 func createInferExt(testConfig *testutils.TestConfig, filePath string) {
-	inManifests := testutils.ReadYaml(filePath)
+
+	// This image needs to be updated to open multiple ports and respond.
+	inManifests := testutils.ReadYaml(filePath) // Modify inference-pool.yaml
 	ginkgo.By("Replacing placeholders with environment variables")
 	outManifests := []string{}
 	replacer := strings.NewReplacer(