ci: drop the phabricator refresh step stable

ci: drop the phabricator refresh step

Now that phabricator is no longer in us, we should avoid this useless step to
save time and simplify things.

--- a/contrib/heptapod-ci.yml	Sun May 22 01:48:20 2022 +0200
+++ b/contrib/heptapod-ci.yml	Wed Jun 01 03:08:15 2022 +0200
@@ -47,24 +47,6 @@
         - echo "python used, $PYTHON"
         - make rust-tests
 
-phabricator-refresh:
-    stage: phabricator
-    except:
-      refs:
-        - merge_requests
-      variables:
-        - $PHABRICATOR_TOKEN == "NO-PHAB"
-    variables:
-      DEFAULT_COMMENT: ":white_check_mark: refresh by Heptapod after a successful CI run (:octopus: :green_heart:)"
-      STABLE_COMMENT: ":white_check_mark: refresh by Heptapod after a successful CI run (:octopus: :green_heart:)\n⚠ This patch is intended for stable ⚠\n{image https://media.giphy.com/media/nYI8SmmChYXK0/source.gif}"
-    script:
-      - |
-        if [ `hg branch` == "stable" ]; then
-            ./contrib/phab-refresh-stack.sh --comment "$STABLE_COMMENT";
-        else
-            ./contrib/phab-refresh-stack.sh --comment "$DEFAULT_COMMENT";
-        fi
-
 test-py2:
     <<: *runtests
     variables: