MM-33601: Invalidate team member cache when updating a team scheme. (#17384)

* MM-33601: Invalidate team member cache when updating a team scheme.

* MM-33601: Tests cache invalidation.

* MM-33601: Test fix.

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/team.go

@@ -233,6 +233,8 @@ func (a *App) UpdateTeamScheme(team *model.Team) (*model.Team, *model.AppError)
 		}
 	}
 
+	a.ClearTeamMembersCache(team.Id)
+
 	a.sendTeamEvent(oldTeam, model.WEBSOCKET_EVENT_UPDATE_TEAM_SCHEME)
 
 	return oldTeam, nil