Increase visual diff concurrency

[sserrata]

Summary

• add paths option to sitemap-visual-diff.ts for filtering sitemap URLs
• update workflow to run visual diffs only on paths containing /tests/
• run the workflow with concurrency set to 4

Testing

• yarn lint
• yarn test

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https://chatgpt.com/codex/tasks/task_e_6863c9430bb483238644c06104c075dc

[github-actions]

Visit the preview URL for this PR (updated for commit 59f828a):

https://docusaurus-openapi-36b86--pr1187-ecxrferm.web.app

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[github-actions]

Visual Diff Summary

View Logs

Total: 319, Matches: 300, Diffs: 19, Skipped: 0

Page	Status
/category/cos-api	diff
/category/customization	diff
/category/food-api	diff
/category/restaurant-api	diff
/category/yogurt-api	diff
/cos/cloud-object-storage	diff
/food/burgers/burger-example	diff
/food/burgers/list-all-burgers	diff
/food/yogurtstore/frozen-yogurt-example	diff
/food/yogurtstore/list-all-flavors	diff
/petstore/user	diff
/petstore31/user	diff
/restaurant/schemas/payment	diff
/tests/additionalproperties-variations-api	diff
/tests/anyof-variations-api	diff
/tests/const	diff
/tests/enum-descriptions-test	diff
/tests/oneof-variations-api	diff
/root	diff