Docs: Add missing @global documentation in server-timing.php

[noruzzamans]

Summary of Changes
Improved code documentation by adding the missing @global annotations to packages/e2e-tests/mu-plugins/server-timing.php
, ensuring better clarity and maintainability.

Testing Instructions

1. Open packages/e2e-tests/mu-plugins/server-timing.php
2. Confirm that the hook callbacks now include the required @global documentation for $timestart and $wpdb.

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[Mamaduka]

Thanks for working on documentation tasks, @noruzzamans!

This is an internal plugin for e2e tests and can be ignored. We often add or remove them, and the documentation isn't publicly available.

I'm going to close the PR.