chore!: Remove deprecated setCustomFields method (#36832)

Author: MartinSchoeler

.changeset/nasty-beans-breathe.md

@@ -0,0 +1,5 @@
+---
+"@rocket.chat/meteor": major
+---
+
+Removes the deprecated `setCustomFields` method

apps/meteor/app/lib/server/index.ts

@@ -46,7 +46,6 @@ import './methods/setUsername';
 import './methods/unarchiveRoom';
 import './methods/unblockUser';
 import './methods/updateMessage';
-import './methods/saveCustomFields';
 import './methods/checkFederationConfiguration';
 
 export * from './lib';