Role-targeted broadcast messages

What does this MR do and why?

Issue: gitlab-org/growth/team-tasks#461 (closed)

This MR implements role-targeted broadcast messages. It allows admins to create broadcast messages that will be shown only to users with the selected role(s) in group/sub-group/project pages.

Role-targeted broadcast messages will be shown in all pages where we can infer a project, group or sub-group from the URL using namespace_id, id, project_id, or group_id params. For example, assuming the current user has the target role, the following table shows some examples of where the broadcast message will be displayed/not displayed.

Page	URL	Display role-targeted broadcast message?
Project page	/my-group/my-project	Yes
Project members page	/my-group/my-project/-/project_members	Yes
Group page	/my-group	Yes
Sub-group page	/my-group/my-subgroup	Yes
Groups list page	/dashboard/groups	No

Database

rails db:migrate

$ rails db:migrate
== 20220128081329 AddTargetAccessLevelsToBroadcastMessages: migrating =========
-- add_column(:broadcast_messages, :target_access_levels, :integer, {:array=>true, :null=>false, :default=>[]})
   -> 0.0049s
== 20220128081329 AddTargetAccessLevelsToBroadcastMessages: migrated (0.0050s)

rails db:rollback

$ rails db:rollback
== 20220128081329 AddTargetAccessLevelsToBroadcastMessages: reverting =========
-- remove_column(:broadcast_messages, :target_access_levels, :integer, {:array=>true, :null=>false, :default=>[]})
   -> 0.0060s
== 20220128081329 AddTargetAccessLevelsToBroadcastMessages: reverted (0.0120s)

Screenshots or screen recordings

Demo

https://www.youtube.com/watch?v=2Sj_i1aJ8x8

Updates on the form

Created role-targeted broadcast message

How to set up and validate locally

Setup

1. Enable the feature

   Feature.enable(:role_targeted_broadcast_messages)

2. Login as admin (GDK root user)
3. Go to http://127.0.0.1:3000/admin/broadcast_messages and create a broadcast message with Target Role(s)
   Form

   
   Created broadcast message in the table

   

Validate

1. Login with a non-admin user
2. Go to a project/group/sub-group page where the role of the currently logged-in user matches one of the roles you set when you created the broadcast message
3. Validate that the broadcast message is displayed
   Project members page where current user is a developer

   

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.