Add phpcbf integration to auto-fix rector output per project coding standards
### Problem/Motivation Integrate phpcbf to automatically apply project-specific coding standard fixes to rector output. Resolve phpcs configuration matching the GitLab CI template's priority (phpcs.xml over phpcs.xml.dist over .gitlab-ci.yml default), pass file extensions explicitly so non-.php Drupal files (.module, .install, .inc) are formatted, and fall back gracefully when a project references coder via a relative path that cannot resolve. ### Work items - Commit(s): [45f6124d6c](https://git.drupalcode.org/project/project_analysis/-/commit/45f6124d6c5a), [633d203d88](https://git.drupalcode.org/project/project_analysis/-/commit/633d203d88e0), [f5f7682aca](https://git.drupalcode.org/project/project_analysis/-/commit/f5f7682acac6) ### Credit - Implemented by: @bbrala - Reported by: @mandclu, @joachim, @James_Wilson - Test-project feedback: @goba, @nicxvan, @wimleers, @rfay, @larowlan --- *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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