Remove legacy performance tests

Author: kean

Tests/NukePerformanceTests/ImagePipelinePerformanceTests.swift

@@ -12,26 +12,6 @@ class ImagePipelinePerfomanceTests: XCTestCase {
     func testLoaderOverallPerformance() {
         let pipeline = makePipeline()
 
-        let requests = (0...5000).map { ImageRequest(url: URL(string: "http://test.com/\($0)")) }
-        let callbackQueue = DispatchQueue(label: "testLoaderOverallPerformance")
-        measure {
-            var finished: Int = 0
-            let semaphore = DispatchSemaphore(value: 0)
-            for request in requests {
-                pipeline.loadImage(with: request, progress: nil) { _ in
-                    finished += 1
-                    if finished == requests.count {
-                        semaphore.signal()
-                    }
-                }
-            }
-            semaphore.wait()
-        }
-    }
-
-    func testAsyncAwaitPerformance() {
-        let pipeline = makePipeline()
-
         let requests = (0...5000).map { ImageRequest(url: URL(string: "http://test.com/\($0)")) }
 
         measure {