Merge #6930: ci: fetch fast in clang-diff-format.yml

fa22c3d ci: fetch fast in clang-diff-format.yml (pasta)

Pull request description:

  ## Issue being fixed or feature implemented
  Fetch fast in clang-diff CI. It used 268 minutes in last ~30 days. Each run I look at shows ~80% of the time being spent fetching.

  ## What was done?

  ## How Has This Been Tested?

  ## Breaking Changes

  ## Checklist:
    _Go over all the following points, and put an `x` in all the boxes that apply._
  - [ ] I have performed a self-review of my own code
  - [ ] I have commented my code, particularly in hard-to-understand areas
  - [ ] I have added or updated relevant unit/integration/functional/e2e tests
  - [ ] I have made corresponding changes to the documentation
  - [x] I have assigned this pull request to a milestone _(for repository code-owners and collaborators only)_

ACKs for top commit:
  UdjinM6:
    utACK fa22c3d

Tree-SHA512: a06b6da2d59a19434f9e6fd1c812ff4c34c1f6495fc10aceabe9935eece4b32a237adedf0d97d6498d46e74e066a5a11d30341d542ed7433d14fd5c2a89d9e55

Author: PastaPastaPasta

.github/workflows/clang-diff-format.yml

@@ -11,7 +11,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v3
       - name: Fetch git
-        run: git fetch
+        run: git fetch -fu origin develop:develop
       - name: Run Clang-Format-Diff.py
         run: |
           git diff -U0 origin/develop -- $(git ls-files -- $(cat test/util/data/non-backported.txt)) | ./contrib/devtools/clang-format-diff.py -p1 > diff_output.txt