[Violet Rails Core]: Change scoping of api_clients and redirection after api_resource is deleted.

[alis-khadka]

In the above image, the url gives the indication that the displayed api_clients are under a specific api_namespace. But, we are displaying all the api_clients in this page.

# GET /api_clients or /api_clients.json
  def index
    @api_clients = ApiClient.all
  end

And the redirect is wrong too (we should remove the view that is rendered on the redirect after the user deletes an API resource).

[donrestarone]

https://api.rubyonrails.org/classes/ActionController/Redirecting.html#method-i-redirect_back