Re-enable Firebase proxy testing for prod and staging

FirebaseAI/Tests/TestApp/Tests/Integration/GenerateContentIntegrationTests.swift

@@ -116,9 +116,8 @@ struct GenerateContentIntegrationTests {
 
   @Test(arguments: [
     InstanceConfig.vertexV1Beta,
-    // TODO(andrewheard): Configs temporarily disabled due to backend issue.
-    // InstanceConfig.developerV1Beta,
-    // InstanceConfig.developerV1BetaStaging
+    InstanceConfig.developerV1Beta,
+    InstanceConfig.developerV1BetaStaging,
     InstanceConfig.developerV1BetaSpark,
   ])
   func generateImage(_ config: InstanceConfig) async throws {

FirebaseAI/Tests/TestApp/Tests/Utilities/InstanceConfig.swift

@@ -51,9 +51,8 @@ struct InstanceConfig {
     vertexV1Staging,
     vertexV1Beta,
     vertexV1BetaStaging,
-    // TODO(andrewheard): Configs temporarily disabled due to backend issue:
-    // developerV1Beta,
-    // developerV1BetaStaging,
+    developerV1Beta,
+    developerV1BetaStaging,
     developerV1Spark,
     developerV1BetaSpark,
   ]
@@ -63,9 +62,8 @@ struct InstanceConfig {
     vertexV1Staging,
     vertexV1Beta,
     vertexV1BetaStaging,
-    // TODO(andrewheard): Configs temporarily disabled due to backend issue:
-    // developerV1Beta,
-    // developerV1BetaStaging,
+    developerV1Beta,
+    developerV1BetaStaging,
     developerV1BetaSpark,
   ]