Issue#3069 - (DCC Issue 675) - Org Admin and Super Admin searches and

[johnpinto1]

pagination of user's plans broken.

Fix for issue #3069 and DCC issue
https://github.com/DigitalCurationCentre/DMPonline-Service/issues/675.

Changes:
  - Replaced view files /paginable/plans/org_admin_other_user with /paginable/plans/_index.html.erb
    with extra checks for plan.owner.present? as missing plan.owner broke a DCC user's plans being render by org_admin. (@briri  & @raycarrick  this was cause of strange behaviour I mention in https://github.com/DigitalCurationCentre/DMPonline-Service/issues/675#issuecomment-990906539 )
  - Replaced partial with '/paginable/plans/org_admin_other_user'  with '/paginable/plans/index',
     replaced action'org_admin_other_user' with 'index' in paginable_renderiser() method in views
    /org_admin/users/edit.html.erb. /org_admin/users/plans.html.erb and /super_admin/users/edit.html.erb.
  - In Paginable::PlansController replaced -
    # GET /paginable/plans/org_admin/:page  with # GET /paginable/users/:id/plans
    associated with method org_admin_other_user()  renamed index()
  - Routes replaced
    get "org_admin_other_user/:page", action: :org_admin_other_user,
                                    on: :collection, as: :org_admin_other_user
    # Paginable actions for users
    resources :users, only: [] do
      get "index/:page", action: :index, on: :collection, as: :index

    with

    resources :users, only: %i[index] do
       member do
         resources :plans, only: %[index]
       end
    end