Improve coding standards application for projects with .gitlab-ci.yml
### Problem/Motivation
Enhance the phpcbf application logic to better detect and use phpcs configuration for projects that rely on .gitlab-ci.yml for CI setup, ensuring rector output conforms to each project's coding standards.
### Work items
- Commit(s): [cec3dc3715](https://git.drupalcode.org/project/project_analysis/-/commit/cec3dc3715ee), [d22b9e6076](https://git.drupalcode.org/project/project_analysis/-/commit/d22b9e6076f3)
### Credit
- Implemented by: @bbrala
- Test-project feedback: @goba, @nicxvan, @wimleers, @rfay, @larowlan
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*Filed retroactively as part of the Drupal 12 rector coverage effort. Closed as fixed; credit to be applied to the contributors listed above.*
*AI was used extensively to build this work and to file this issue. See [Dries Buytaert: AI-generated Rector rules for Drupal](https://dri.es/ai-generated-rector-rules-for-drupal) and [Björn Brala: Drupal Rector rules are config, not code. Mostly.](https://www.linkedin.com/pulse/drupal-rector-rules-config-code-mostly-bj%C3%B6rn-brala-vfpwe/).*
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