Remove more environment variables when launching inferior swift-test binaries from Xcode, so they don't hang while trying to connect to Xcode. There is already a superior xctest invocation that's using them, and we need to make sure we're not passing them on so that the xctest invocation being invoked by swift-test thinks it's invoked directly from Xcode. We should possibly be filtering out all environment variables prefixed with "XCTest", or maybe even better, use an allow-list of environment variables to avoid having the environment leaking into the test.

rdar://68362616

Author: abertelrud

Sources/TSCTestSupport/Product.swift

@@ -89,6 +89,8 @@ extension Product {
       #if Xcode
          // Unset these variables which causes issues when running tests via Xcode.
         environment["XCTestConfigurationFilePath"] = nil
+        environment["XCTestSessionIdentifier"] = nil
+        environment["XCTestBundlePath"] = nil
         environment["NSUnbufferedIO"] = nil
       #endif
         // FIXME: We use this private environment variable hack to be able to