meta: do not rebase when preparing beta candidates

We want to keep the stable branch merge commit, and the rebase
doesn't play nice with it.

.github/workflows/release-beta-candidate.yml

@@ -15,12 +15,6 @@ jobs:
         uses: actions/checkout@v3
         with:
           branch: release-beta
-      - name: Rebase
-        run: |
-          git fetch origin ${{ env.BETA_BRANCH }} --depth=1
-          git config --global user.email "actions@github.com"
-          git config --global user.name "GitHub Actions"
-          git rebase FETCH_HEAD
       - name: Get yarn cache directory path
         id: yarn-cache-dir-path
         run: echo "::set-output name=dir::$(corepack yarn config get cacheFolder)"