Add Prettier for YAML formatting to Ultralytics Actions (#13236)

Co-authored-by: UltralyticsAssistant <web@ultralytics.com>

.github/workflows/format.yml

@@ -20,7 +20,8 @@ jobs:
         with:
           token: ${{ secrets.GITHUB_TOKEN }} # automatically generated, do not modify
           python: true # format Python code and docstrings
-          markdown: true # format Markdown and YAML
+          markdown: true # format Markdown
+          prettier: true # format YAML
           spelling: true # check spelling
           links: false # check broken links
           summary: true # print PR summary with GPT4 (requires 'openai_api_key' or 'openai_azure_api_key' and 'openai_azure_endpoint')