Update Collaborators Add, Remove, and Search

[theck13]

Update the add and remove actions on the Collaborators screen as listed below:

• Add Collaborator Hint Toast (1753)
• Remove Collaborator Hint Toast (1760)
• Remove Collaborator Touch Feedback (1760)
• Add Collaborator List Search (1764)

[dangermattic]

Thanks for reporting! 👍

[theck13]

I'll work on this. Please, someone assign me to this issue since I can't assign myself.