Drop archive policy from enable-legacy-telemetry

Adding it there will basically enforce using the archive policy
high all over, and will prevent using any other.

Change-Id: I9d471633d5650544f2fd9a2b00bd9aa166c737c3
(cherry picked from commit 10e0652199)
(cherry picked from commit d5726a1326)
(cherry picked from commit 83441c397b)
(cherry picked from commit f365caa0d6)

environments/enable-legacy-telemetry.yaml

@@ -25,6 +25,6 @@ parameter_defaults:
   CeilometerEnableGnocchi: true
   ManagePipeline: true
   EventPipelinePublishers:
-    - gnocchi://?archive_policy=high
+    - gnocchi://
   PipelinePublishers:
-    - gnocchi://?archive_policy=high
+    - gnocchi://