User does not know that Tags are globally visible

[tbsbdr]

Steps to reproduce

1. Create a tag
2. User does not know that Tags are globally visible (if
   

Expected behaviour

User should know who can see Tags:

• Add Contextual Helper next to "Add or edit Tags"
  • Title: "Who can view Tags?"
  • Body: "Everyone who can view the file can view it's Tags. Everyone who can edit the file can edit it's Tags."

Actual behaviour

User does not know that Tags are globally visible

[tbsbdr]

@JammingBen please remove "good first issue" if this is not the case =D

[phil-davis]

And even if a user does not have access to any resource that has that tag, I think that the tag "string/name" can be seen by the user. For example:

• Alice tags a file in space "Special-Projects" with "Project-Three-Letter-Agency"
• and "Three-Letter-Agency" is not supposed to be known about in the wider organisation
• Brian has access to space "Special-Projects" and can see the tag - no problem
• Carol does not have access to space "Special-Projects"
• Carol starts to tag a file in one of her spaces. She types "Project-T" and "Project-Three-Letter-Agency" is displayed as a suggestion. (Carol was going to add a tag "Project-Training", and accidentally sees the other tag name)
• the information in the tag name has been "leaked" more widely

So users need to be aware that they should not embed "private"/"confidential" information in a tag name.

[tbsbdr]

Carol types "Project-T" and "Project-Three-Letter-Agency" is displayed as a suggestion.

Thats not the case with Web + OCIS
visibility of the tag is bound to the visibility of the resource🪢
but still thats not clear and should be told.

[JammingBen]

Has been fixed via #9525.