fix: status_code as integer in metrics

[enicioli]

Description

Explain what this PR does and why it is needed.

Type of change

• Bug fix
• New feature
• Documentation
• Performance/Refactor
• CI/CD/Chore

Checklist

• Title follows Conventional Commits (e.g., feat: add SQS aspect)
• Tests added/updated
• composer test passes locally
• Documentation updated (README/Docs)
• No breaking changes (or documented if any)

Related issues

Closes #, Relates to #

[Copilot]

Pull Request Overview

This PR fixes the data type inconsistency for HTTP status codes in metrics by changing them from strings to integers. The change ensures that status codes are consistently represented as numeric values rather than string representations.

• Changes status code attributes from string format (e.g., '200', '500') to integer format (e.g., 200, 500)
• Updates both the production middleware code and corresponding test expectations

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/Middleware/MetricMiddleware.php	Removes string casting of status codes and uses hardcoded integer 500 for exceptions
tests/Unit/Middleware/MetricMiddlewareTest.php	Updates test expectations to match integer status codes

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