Plug transform annotations thru cross-lang interface (#33150) (#33156)

* plug annotations thru

* trigger xlang tests

Co-authored-by: Ahmed Abualsaud <65791736+ahmedabu98@users.noreply.github.com>

.github/trigger_files/beam_PostCommit_Python_Xlang_Gcp_Dataflow.json

@@ -1,4 +1,3 @@
-
 {
   "comment": "Modify this file in a trivial way to cause this test suite to run",
   "modification": 2

.github/trigger_files/beam_PostCommit_Python_Xlang_IO_Dataflow.json

@@ -1,4 +1,4 @@
 {
   "comment": "Modify this file in a trivial way to cause this test suite to run",
-  "modification": 2
+  "modification": 3
 }

.github/trigger_files/beam_PostCommit_Python_Xlang_IO_Direct.json

@@ -1,4 +1,4 @@
 {
   "comment": "Modify this file in a trivial way to cause this test suite to run",
-  "modification": 1
+  "modification": 2
 }

sdks/python/apache_beam/transforms/external.py

@@ -923,6 +923,7 @@ def _normalize(coder_proto):
             for tag,
             pcoll in self._expanded_transform.outputs.items()
         },
+        annotations=self._expanded_transform.annotations,
         environment_id=self._expanded_transform.environment_id)