chore: fix the enum backfill workflow to configure the cdk automation github user (#34180)

### Issue # (if applicable)

N/A

### Reason for this change
Fix failling Enum Backfill Github action to set the CDK Automation user details before creating the Enums PRs.

### Checklist
- [X] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: moelasmar

.github/workflows/enum-auto-updater.yml

@@ -77,6 +77,8 @@ jobs:
         if: steps.git-check.outputs.changes == 'true'
         run: |
           # Iterate through each module directory that has changes
+          git config --global user.name 'aws-cdk-automation'
+          git config --global user.email 'aws-cdk-automation@users.noreply.github.com'
           for module in $(git diff --name-only | grep -E '^packages/(@aws-cdk|aws-cdk-lib)/.*' | sed -E 's|^packages/(@aws-cdk\|aws-cdk-lib)/([^/]+).*|\2|' | sort -u); do
             moduleName=$(basename $module)