chore!: remove activity log feeds (#33294)

- This contains little to no information and practically no one uses this.
- Also causes a lot of problem by adding way too many feeds in activity
  log to the point where activity page doesn't even load.

erpnext/controllers/buying_controller.py

@@ -25,10 +25,6 @@ class BuyingController(SubcontractingController):
 	def __setup__(self):
 		self.flags.ignore_permlevel_for_fields = ["buying_price_list", "price_list_currency"]
 
-	def get_feed(self):
-		if self.get("supplier_name"):
-			return _("From {0} | {1} {2}").format(self.supplier_name, self.currency, self.grand_total)
-
 	def validate(self):
 		super(BuyingController, self).validate()
 		if getattr(self, "supplier", None) and not self.supplier_name: