[nightly] dont prune in phab tag cleanup

Summary: -P still isnt supported in v2.11 which is what the default circle image uses. I don't think we need it since we are doing a fresh checkout - so just do the clean up part.

Test Plan: eyes

Reviewers: max

Reviewed By: max

Differential Revision: https://dagster.phacility.com/D147

.circleci/config.yml

@@ -75,5 +75,4 @@ jobs:
       - run:
           name: Clean Phabricator Tags
           command: |
-            git fetch -p -P origin
             git tag | grep phabricator | xargs git push -d origin