Follow-up to https://github.com/discourse/discourse/pull/31887
This commit introduces a new design for the components listing page, which
is not linked from anywhere in the UI at the moment, but it can be
accessed by heading to the `/admin/config/customize/components` path
directly. We'll make this new design available from the sidebar and
remove the old page once we've tested and validated the new design
internally.
Internal topic: t/146007.
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Co-authored-by: Ella <ella.estigoy@gmail.com>
