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
This commit attempts to improve the mobile experience for admin page header and subheader by automatically collapsing all action buttons in these components into a DMenu when viewing mobile. This is done by using different "list" wrapper components and a DMenu trigger and a DropdownMenu on mobile only, and uses has-block to determine whether to render the DMenu trigger at all. This also removes the `PluginOutlet` in `AdminPluginConfigPage`, it was too inflexible for this `DropdownMenu` case, and since the `:actions` were always rendering we couldn't rely on `has-block`. A new plugin API, `registerPluginHeaderActionComponent`, has been introduced instead to replace it.