* Rename `provider` to `providerConfig`
The network controller `provider` state has been renamed to
`providerConfig`. This better reflects what this state is, and makes
this controller more closely aligned with the core network controller.
All references to the provider configuration have been updated to
prefer `providerConfig` over `provider`, to make the distinction clear
between a provider and provider config.
Closes#18902
* Add migration
* Updating account menu icon color
* Updating design-tokens and making appropriate updates to extension styles
* Adding more deprecated tags to colors
* Adding spinner and removing todo comment
* Remove comment
* Updates
* Updating snapshots
* More color and ui updates
* reverting transition change
