Do not trigger notifications to users not suggested for mentions

• Type: Story
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: None
• Fix Version/s: None
• Component/s: DM
• Labels:
  • fc_20_05
• Epic Link: lima-content-page-review-mode

As a site admin

I want that users cannot mention users that they are not allowed to (for example because they don't have permissions to access the page they are being mentioned)

so that users do not receive notifications for being mentioned in places they cannot access