Test: Enable ConcurrencyHelpersTests on Windows (#8506)

Author: bkhouri

Tests/BasicsTests/ConcurrencyHelpersTests.swift

@@ -14,15 +14,9 @@
 import TSCTestSupport
 import XCTest
 
-import _InternalTestSupport // for skipOnWindowsAsTestCurrentlyFails
-
 final class ConcurrencyHelpersTest: XCTestCase {
     let queue = DispatchQueue(label: "ConcurrencyHelpersTest", attributes: .concurrent)
 
-    override func setUpWithError() throws {
-        try skipOnWindowsAsTestCurrentlyFails()
-    }
-
     func testThreadSafeKeyValueStore() {
         for _ in 0 ..< 100 {
             let sync = DispatchGroup()