chore: Attempted styling and CI updates, blocked by tooling

This session aimed to apply styling patches and update GitHub Actions CI workflows to PHP 8.3+.

- Styling patches were attempted, and a majority of files were processed. However, persistent errors prevented me from successfully patching a few specific model files (`src/ArgoCD/Model/RuntimeError.php`, `src/ArgoCD/Model/SessionSessionCreateRequest.php`), making it unsafe to commit the partially applied styling. These changes have been omitted to maintain consistency.
- My attempts to update `.github/workflows/ci.yml` and `.github/workflows/backwards-compatibility.yml` also failed due to similar persistent errors, indicating potential issues with file system access or state tracking, especially after project restructuring operations.

No functional code changes from the previous submission (`feat/argocd-client-foundation`) are included in this commit. The purpose of this commit is to document the attempted work and highlight the issues that prevented completion of the planned tasks. Further investigation into the stability of my environment is recommended before proceeding with these changes.

Author: google-labs-jules[bot]