Update pre-commit workflow set --show-diff-on-failure (#2487)

Without this flag, when a hook fails because it modified files, pre-commit will simply indicate that files were modified and the hook failed,
without showing the specific changes. The developer would then have to manually run git diff or inspect the files to see what happened

Author: jbampton

.github/workflows/pre-commit.yml

@@ -57,4 +57,4 @@ jobs:
           path: ~/.cache/pre-commit
           key: pre-commit|${{ env.PY }}|${{ hashFiles('.pre-commit-config.yaml') }}
       - name: Run pre-commit
-        run: pre-commit run --color=always --all-files
+        run: pre-commit run --color=always --all-files --show-diff-on-failure