chore: Remove CodeClimate integration

[meyfa]

CodeClimate is discontinued.

[Copilot]

Pull Request Overview

This PR removes the deprecated CodeClimate integration from the project after CodeClimate was discontinued. It also updates the copyright year to 2025.

• Removes CodeClimate badges from README
• Deletes the entire coverage job from GitHub Actions workflow
• Removes CodeClimate configuration file and its reference in .gitattributes
• Updates copyright year to 2025

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
README.md	Removes CodeClimate maintainability and test coverage badges
LICENSE	Updates copyright year from 2024 to 2025
.github/workflows/php.yml	Removes the entire coverage job that uploaded reports to CodeClimate
.gitattributes	Removes reference to deleted .codeclimate.yml file
.codeclimate.yml	Completely removes CodeClimate configuration file

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