Remove last --disable-dart-dev in flutter/flutter. (flutter#154948)

Work towards flutter#154268.

Author: matanlurey

dev/devicelab/lib/framework/runner.dart

@@ -187,8 +187,6 @@ Future<TaskResult> runTask(
   final Process runner = await startProcess(
     dartBin,
     <String>[
-      // TODO(matanlurey): This is load bearing; see https://github.com/flutter/flutter/issues/154268#issuecomment-2318996125.
-      '--disable-dart-dev',
       '--enable-vm-service=0', // zero causes the system to choose a free port
       '--no-pause-isolates-on-exit',
       if (localEngine != null) '-DlocalEngine=$localEngine',