fix: restructure php Dockerfiles to ensure proper user context and cleanup

[dinoallo]

No description provided.

[Copilot]

Pull Request Overview

This PR restructures PHP Dockerfiles for versions 7.4 and 8.2 to improve user context management and cleanup operations. The changes ensure proper separation of root and user operations while maintaining secure file ownership.

• Reorganizes operations to use explicit USER directives for root and devbox contexts
• Consolidates file cleanup and permission operations into separate, context-appropriate steps
• Improves directory structure by creating .devbox directory in the user's home directory

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
Language/php/8.2/Dockerfile	Restructures user context switching and file operations for PHP 8.2 environment
Language/php/7.4/Dockerfile	Applies identical restructuring changes for PHP 7.4 environment

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