Use GlBroadcastMessage in Broadcast Message admin settings page
What does this MR do and why?
Closes #325352 (closed)
This MR intends to migrate to GlBroadcastMessage as defined in the gitlab-ui and Pajamas Design System.
The component itself was migrated to Rails version in shared/_broadcast_message.html.haml.
The settings page has undergone a breaking change. Background color option was removed. Instead, there's a new option called Theme, which uses available themes from the GlBroadcastMessage component.
The visual design for the banner type has also changed and is now Pajamas-compliant. The notification type was left intact.
The messages configured prior to this change will receive a default indigo theme.
Screenshots or screen recordings
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How to set up and validate locally
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