CodeRabbit Generated Unit Tests: Add unit tests for PR changes

[coderabbitai]

Unit test generation was requested by @superdav42.

• perf: lazy settings sections & default value fallbacks #355 (comment)

The following files were modified:

• tests/WP_Ultimo/Admin_Pages/Top_Admin_Nav_Menu_Test.php
• tests/WP_Ultimo/Apis/MCP_Abilities_Test.php
• tests/WP_Ultimo/Dashboard_Widgets_Test.php
• tests/WP_Ultimo/Functions/Settings_Functions_Test.php
• tests/WP_Ultimo/Gateways/Manual_Gateway_Test.php
• tests/WP_Ultimo/Maintenance_Mode_Test.php
• tests/WP_Ultimo/Settings_Test.php
• tests/WP_Ultimo/Whitelabel_Test.php

[coderabbitai]

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[github-actions]

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