Add a new `stub_mattermost_setting` stub helper to properly stub Mattermost settings
What does this MR do?
This adds a new stub_mattermost_setting
method to properly stub Mattermost settings.
Closes #30172 (closed) /cc @zj
This adds a new stub_mattermost_setting
method to properly stub Mattermost settings.
Closes #30172 (closed) /cc @zj