Remove `store.$plugin` and refactor nuxtClientInit from the state

[codyrancher]

Description

Refactor logic which currently:

• Add this code as a plugin and set store.$plugin as global variable
• Set other context values as global variable
• Dispatch action with mentioned code
• Expose plugin method to models that are called into the view to retrieve data with getDynamic()

Ideally this whole initialization could be handled within the entry.js file, so nuxtClientInit action can be moved there.

Initial report

Unfortunately the initialization code has circular dependencies between creating the router and creating the store that will need to be untangled before this can be tackled.

https://github.com/rancher/dashboard/pull/11266/files#r1665683957

$plugin is being set by the code at https://github.com/rancher/dashboard/blob/5a00bcc07cd7cf724fa6ca0d1ca7dff57108b23f/shell/store/index.js#L1149

[cnotv]

@codyrancher Can I rephrase the title/description so it matches to remove the whole Nuxt part and move initialization out of the store? We have this very part as a whole to be moved out: https://github.com/rancher/dashboard/blob/master/shell/store/index.js#L1167

[cnotv]

My current work and investigation end up here @codyrancher https://github.com/cnotv/dashboard/tree/feature/11386-nuxt-client-init-removal

I have identified an issue with $plugins (whatever it is) to be not mounted for some reason and being used just for getDynamic().

The whole logic must be taken out from the state management and put together with the state initialization (wherever is the point)