refactor: simplification

[rustatian]

Reason for This PR

Remove PHP test dependencies that the worker does not use.

Description of Changes

• Keep the four PHP packages used by the test worker. Remove 14 unused direct requirements and the unused HTTP discovery plugin setting.

License Acceptance

By submitting this pull request, I confirm that my contribution is made under the terms of the MIT license.

PR Checklist

• All commits in this PR are signed (git commit -s).
• The reason for this PR is clearly provided (issue no. or explanation).
• The description of changes is clear and encompassing.
• Any required documentation changes (code and docs) are included in this PR.
• Any user-facing changes are mentioned in CHANGELOG.md.
• All added/changed functionality is tested.

[Copilot]

Copilot review overview

🟢 Approval recommended

The retained dependencies cover every package referenced by the PHP test worker.

Review effort: Balanced
Findings: None

What changed in this PR

Simplifies the PHP test-worker dependencies by retaining only directly used packages.

Changes:

• Removes 14 unused requirements.
• Removes the unused HTTP discovery plugin configuration.

File	Description
tests/​php_test_files/​composer.json	Reduces test-worker Composer dependencies and configuration.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.11%. Comparing base (71f5242) to head (93e76f3).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #256   +/-   ##
=======================================
  Coverage   94.11%   94.11%           
=======================================
  Files           1        1           
  Lines          17       17           
=======================================
  Hits           16       16           
  Misses          1        1           

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