combine frontend testing documentation pages

[madewithkode]

Fixes

Fixes #4514 by @sarayourfriend

Description

• Combine playwright_tests.md and storybook_tests.md documentation pages into testing_guidelines.md to improve general clarity and cohesion. Specific portions of playwright_tests.md and storybook_tests.md that talked about testing were also moved to /frontend/guides/test.html. Necessary redirects have also been put in place.
• Update the bot comment when playwright tests fail on CI to point to the relevant parts of the documentation for help in resolving.

Testing Instructions

Navigate to frontend/reference/testing_guidelines.html
You should now find "Playwright" and "Storybook" sections derived from contents of playwright_tests.md and storybook_tests.md respectively.

Checklist

• My pull request has a descriptive title (not a vague title likeUpdate index.md).
• My pull request targets the default branch of the repository (main) or a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible errors.
• I ran the DAG documentation generator (./ov just catalog/generate-docs for catalog
  PRs) or the media properties generator (./ov just catalog/generate-docs media-props
  for the catalog or ./ov just api/generate-docs for the API) where applicable.

Developer Certificate of Origin

Developer Certificate of Origin

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[github-actions]

Full-stack documentation: https://docs.openverse.org/_preview/4546

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Changed files 🔄:

• https://docs.openverse.org/_preview/4546/frontend/guides/test.html
• https://docs.openverse.org/_preview/4546/frontend/reference/index.html
• https://docs.openverse.org/_preview/4546/frontend/reference/testing_guidelines.html

[sarayourfriend]

Cool, LGTM! Your approach to keep the separate steps and reference makes sense to me along this split 👍

[zackkrida]

Great! LGTM.