Skip DTS E2E rewind tests until available

Author: andystaples

tests/durabletask-azuremanaged/test_dts_rewind_e2e.py

@@ -12,7 +12,10 @@
 
 # NOTE: These tests assume a sidecar process is running. Example command:
 #       docker run -i -p 8080:8080 -p 8082:8082 -d mcr.microsoft.com/dts/dts-emulator:latest
-pytestmark = pytest.mark.dts
+pytestmark = [
+    pytest.mark.dts,
+    pytest.mark.skip(reason="Rewind support is not yet available in the public DTS emulator"),
+]
 
 # Read the environment variables
 taskhub_name = os.getenv("TASKHUB", "default")