Update the testing steps docs to 1.4.x
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## Description
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Explain the context and motivation — the why behind this task. A contributor unfamiliar with the background should be able to understand the purpose without reading prior discussions.
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Update the doc: https://project.pages.drupalcode.org/ai/1.4.x/contribute/testing/full_patch_test/
- To have 1.4.x based testing steps
- more importantly Adding global guardrails test
- Find out anything more changes in 1.4.x which should be added. Check the diff.
## Tasks
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* [ ]
## Acceptance criteria
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- Site builders can configure X via the UI without writing code.
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## Testing instructions *(added by implementor before review)*
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Testing Setup (optional — to verify on a clean install):
mkdir my-drupal-site && cd my-drupal-site
ddev config --project-type=drupal11 --docroot=web
ddev composer create-project drupal/cms
ddev drush site:install --account-name=admin --account-pass=admin -y
# Enable AI Dashboard and ai_api_explorer
# Launch the site and open the AI dashboard to add an OpenAI or Anthropic key:
ddev launch $(ddev drush uli /admin/config/ai)
-->
1.
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