Revert addition of file-based reference test

Author: theoriginalbit

Tests/OpenAPIGeneratorReferenceTests/FileBasedReferenceTests.swift

@@ -43,11 +43,6 @@ final class FileBasedReferenceTests: XCTestCase {
     }
 
     func testPetstore() throws { try _test(referenceProject: .init(name: .petstore)) }
-    
-    func testPetstoreWithServerVariablesEnumsFeatureFlag() throws {
-        let featureFlags: FeatureFlags = [.serverVariablesAsEnums]
-        try _test(referenceProject: .init(name: .petstore(featureFlags)), featureFlags: featureFlags)
-    }
 
     // MARK: - Private
 
@@ -102,27 +97,12 @@ final class FileBasedReferenceTests: XCTestCase {
         )
     }
 
-    enum ReferenceProjectName: Hashable {
-        case petstore(FeatureFlags)
-        
-        static var petstore: Self { .petstore([]) }
+    enum ReferenceProjectName: String, Hashable, CaseIterable {
+        case petstore
 
-        var openAPIDocFileName: String {
-            switch self {
-            case .petstore:
-                return "petstore.yaml"
-            }
-        }
+        var openAPIDocFileName: String { "\(rawValue).yaml" }
 
-        var fixtureCodeDirectoryName: String {
-            switch self {
-            case let .petstore(featureFlags):
-                if featureFlags.isEmpty {
-                    return "Petstore"
-                }
-                return "Petstore_" + featureFlags.map(\.rawValue).joined(separator: "_")
-            }
-        }
+        var fixtureCodeDirectoryName: String { rawValue.capitalized }
     }
 
     struct ReferenceProject: Hashable {