[MM-40638] Type all of the websocket event names as a new type WebsocketEventType (#25454)

Co-authored-by: Sudheer Tripathi <sudheer@clearglass.com>
Co-authored-by: Sudheer Tripathi <31629433+sudheer121@users.noreply.github.com>
Co-authored-by: Sudheer Tripathi <tripathisudheer604@gmail.com>

server/channels/app/team.go

@@ -388,7 +388,7 @@ func (a *App) RegenerateTeamInviteId(teamID string) (*model.Team, *model.AppErro
 	return updatedTeam, nil
 }
 
-func (a *App) sendTeamEvent(team *model.Team, event string) *model.AppError {
+func (a *App) sendTeamEvent(team *model.Team, event model.WebsocketEventType) *model.AppError {
 	sanitizedTeam := &model.Team{}
 	*sanitizedTeam = *team
 	sanitizedTeam.Sanitize()