build: use shared circleci dev-infra for common circleci code

This allows us to remove the duplicated `rebase-pr.js` script so that we
can maintain this script in a single place.

Author: devversion

.circleci/config.yml

@@ -149,25 +149,17 @@ orbs:
   # to make sure that snapshot builds are not deployed out of order, resulting in Git
   # push conflicts.
   queue: eddiewebb/[email protected]
+  devinfra: angular/[email protected]
 
 commands:
   checkout_and_rebase:
     description: Checkout and rebase the repository
     steps:
       - checkout
       # After checkout, rebase on top of target branch.
-      - run:
-          name: Rebase PR on target branch
-          environment:
-            CIRCLE_GIT_BASE_REVISION: << pipeline.git.base_revision >>
-            CIRCLE_GIT_REVISION: << pipeline.git.revision >>
-          command: |
-            if [ -n "$CIRCLE_PR_NUMBER" ]; then
-              # User is required for rebase.
-              git config user.name "angular-ci"
-              git config user.email "angular-ci"
-              node .circleci/rebase-pr.js
-            fi
+      - devinfra/rebase-pr-on-target-branch:
+          base_revision: << pipeline.git.base_revision >>
+          head_revision: << pipeline.git.revision >>
 
 # -----------------------------------------------------------------------------------------
 # Job definitions. Jobs which are defined just here, will not run automatically. Each job