Merge CI checkout fix

This merge fixes a mistake I made merging #1461. The issue was that the bot_pr_format_base.sh script tried to create the same branch twice.

Related PR: #1469

Author: MarcelKoch

.github/bot-pr-format-base.sh

@@ -9,10 +9,6 @@ git remote add fork "$HEAD_URL"
 git fetch fork "$HEAD_BRANCH"
 git fetch origin "$BASE_BRANCH"
 
-# checkout current PR head
-LOCAL_BRANCH=format-tmp-$HEAD_BRANCH
-git checkout -b $LOCAL_BRANCH fork/$HEAD_BRANCH
-
 git config user.email "[email protected]"
 git config user.name "ginkgo-bot"