XF upgrade or running xf:rebuild-master-data can result in icons disappearing

[Xon]

The XF GUI upgrade and the CLI commands xf:rebuild-master-data/xf:upgrade run using the XF\Install\App context. In this context code event listeners or class extensions, such as from icon_usage_analyzer_extra or icon_usage_analyzer_steps do not get loaded.

This means various icons which would be registered by this method are not until the rebuild icon usage cache rebuild task manually triggered by an admin.

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