Fix: Duplicate plugins menu item in admin

[ZacharyRener]

Description of the Change

Closes #203

With a certain condition met, two Plugins menu items will appear in the admin sidebar. The duplicate one will have no icon or url. When you collapse the menu, the blank menu item will cover up to uncollapse button, leaving editors stuck in collapsed mode.

How to test the Change

First, follow the steps in #203 to reproduce the duplicate plugin item issue. Then, merge this code in locally, and confirm the duplicate item is no longer being added.

Changelog Entry

Fixed - Duplicate plugins menu item in admin

Credits

Props @ZacharyRener

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added Critical Flows, Test Cases, and/or End-to-End Tests to cover my change.
• All new and existing tests pass.

[Copilot]

Pull request overview

This pull request fixes a bug where duplicate "Plugins" menu items would appear in the WordPress admin sidebar under certain conditions. The duplicate item would have no icon or URL and could block the uncollapse button when the menu is collapsed.

Changes:

• Refactored the conditional logic in set_plugin_menu_update_count() to properly validate menu item existence before attempting to modify it

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