Check what's up with user_my_modules_controller#index_old action, and remove/rename it [SCI-7848]

app/controllers/user_my_modules_controller.rb

@@ -7,14 +7,14 @@ class UserMyModulesController < ApplicationController
   before_action :check_view_permissions, except: %i(create destroy)
   before_action :check_manage_permissions, only: %i(create destroy)
 
-  def index_old
+  def assignees
     @user_my_modules = @my_module.user_my_modules
 
     respond_to do |format|
       format.json do
         render json: {
           html: render_to_string(
-            partial: 'index_old.html.erb'
+            partial: 'assignees.html.erb'
           ),
           my_module_id: @my_module.id,
           counter: @my_module.designated_users.count # Used for counter badge

app/views/canvas/full_zoom/_my_module.html.erb

@@ -9,7 +9,7 @@
   data-module-x="<%= my_module.x %>"
   data-module-y="<%= my_module.y %>"
   data-module-conns="<%= construct_module_connections(my_module) %>"
-  data-module-users-tab-url="<%=  index_old_my_module_user_my_modules_url(my_module_id: my_module.id, format: :json) %>"
+  data-module-users-tab-url="<%=  assignees_my_module_user_my_modules_url(my_module_id: my_module.id, format: :json) %>"
   data-module-tags-url="<%= my_module_tags_experiment_path(my_module.experiment, format: :json) %>">
 
   <div data-view-mode="active">
@@ -83,7 +83,7 @@
   <div class="panel-footer panel-footer-scinote buttons-container">
     <ul class="nav nav-tabs nav-tabs-less" role="tablist">
       <li role="presentation">
-        <a class="btn btn-link task-card-view-users" href="<%= index_old_my_module_user_my_modules_url(my_module_id: my_module.id, format: :json) %>" aria-controls="<%= my_module.id %>_users" role="tab" data-remote="true">
+        <a class="btn btn-link task-card-view-users" href="<%= assignees_my_module_user_my_modules_url(my_module_id: my_module.id, format: :json) %>" aria-controls="<%= my_module.id %>_users" role="tab" data-remote="true">
           <span class="fas fa-users" aria-hidden="true"></span>
           <span class="badge badge-indicator users-badge-indicator <%= 'hidden' unless my_module.designated_users_count.positive? %>"
                 data-linked-id="<%= my_module.id %>">

spec/permissions/controllers/user_my_modules_controller_spec.rb

@@ -6,7 +6,7 @@ describe UserMyModulesController, type: :controller do
   include PermissionExtends
 
   it_behaves_like "a controller with authentication", {
-    index_old: { my_module_id: 1 },
+    assignees: { my_module_id: 1 },
     index: { my_module_id: 1 },
     index_edit: { my_module_id: 1 },
     search: { my_module_id: 1, id: 1 },
@@ -21,7 +21,7 @@ describe UserMyModulesController, type: :controller do
       team_role: :normal_user
     }
 
-    it_behaves_like "a controller action with permissions checking", :get, :index_old do
+    it_behaves_like "a controller action with permissions checking", :get, :assignees do
       let(:testable) { my_module }
       let(:permissions) { [MyModulePermissions::READ] }
       let(:action_params) { { my_module_id: my_module.id } }