MM-10640 Set EnableUserCreation to true by default (#8815)

* Set EnableUserCreation to true by default

* Fix argument type to FormatBool

* Convert EnableUserCreation instances to pointer

* Convert to boolean in tests also

* Set value of pointer to be false

* Convert remaining EnableUserCreation instances to pointer

app/diagnostics.go

@@ -244,7 +244,7 @@ func (a *App) trackConfig() {
 	})
 
 	a.SendDiagnostic(TRACK_CONFIG_TEAM, map[string]interface{}{
-		"enable_user_creation":                    cfg.TeamSettings.EnableUserCreation,
+		"enable_user_creation":                    *cfg.TeamSettings.EnableUserCreation,
 		"enable_team_creation":                    *cfg.TeamSettings.EnableTeamCreation,
 		"restrict_team_invite":                    *cfg.TeamSettings.RestrictTeamInvite,
 		"restrict_public_channel_creation":        *cfg.TeamSettings.RestrictPublicChannelCreation,