refactor: remove add_fetch (#31315)

- Sales Team already had fetch from set up
- Set up fetch from on sales partner in sales transaction

Reason for removal: the JS code applies arbitrarily to any field called "sales_person"
diff --git a/erpnext/accounts/doctype/sales_invoice/sales_invoice.json b/erpnext/accounts/doctype/sales_invoice/sales_invoice.json
index 80b95db..327545a 100644
--- a/erpnext/accounts/doctype/sales_invoice/sales_invoice.json
+++ b/erpnext/accounts/doctype/sales_invoice/sales_invoice.json
@@ -1790,6 +1790,8 @@
    "width": "50%"
   },
   {
+   "fetch_from": "sales_partner.commission_rate",
+   "fetch_if_empty": 1,
    "fieldname": "commission_rate",
    "fieldtype": "Float",
    "hide_days": 1,
@@ -2038,7 +2040,7 @@
    "link_fieldname": "consolidated_invoice"
   }
  ],
- "modified": "2022-03-08 16:08:53.517903",
+ "modified": "2022-06-10 03:52:51.409913",
  "modified_by": "Administrator",
  "module": "Accounts",
  "name": "Sales Invoice",
diff --git a/erpnext/selling/doctype/sales_order/sales_order.json b/erpnext/selling/doctype/sales_order/sales_order.json
index ff921c7..74c5c07 100644
--- a/erpnext/selling/doctype/sales_order/sales_order.json
+++ b/erpnext/selling/doctype/sales_order/sales_order.json
@@ -1359,6 +1359,8 @@
    "width": "50%"
   },
   {
+   "fetch_from": "sales_partner.commission_rate",
+   "fetch_if_empty": 1,
    "fieldname": "commission_rate",
    "fieldtype": "Float",
    "hide_days": 1,
@@ -1547,7 +1549,7 @@
  "idx": 105,
  "is_submittable": 1,
  "links": [],
- "modified": "2022-04-26 14:38:18.350207",
+ "modified": "2022-06-10 03:52:22.212953",
  "modified_by": "Administrator",
  "module": "Selling",
  "name": "Sales Order",
diff --git a/erpnext/selling/sales_common.js b/erpnext/selling/sales_common.js
index 6cb53c3..8ff01f5 100644
--- a/erpnext/selling/sales_common.js
+++ b/erpnext/selling/sales_common.js
@@ -12,8 +12,6 @@
 erpnext.selling.SellingController = class SellingController extends erpnext.TransactionController {
 	setup() {
 		super.setup();
-		this.frm.add_fetch("sales_partner", "commission_rate", "commission_rate");
-		this.frm.add_fetch("sales_person", "commission_rate", "commission_rate");
 	}
 
 	onload() {
@@ -514,4 +512,4 @@
 
 		dialog.show();
 	}
-})
\ No newline at end of file
+})
diff --git a/erpnext/stock/doctype/delivery_note/delivery_note.json b/erpnext/stock/doctype/delivery_note/delivery_note.json
index e3222bc..f9e9349 100644
--- a/erpnext/stock/doctype/delivery_note/delivery_note.json
+++ b/erpnext/stock/doctype/delivery_note/delivery_note.json
@@ -1192,6 +1192,8 @@
    "width": "50%"
   },
   {
+   "fetch_from": "sales_partner.commission_rate",
+   "fetch_if_empty": 1,
    "fieldname": "commission_rate",
    "fieldtype": "Float",
    "label": "Commission Rate (%)",
@@ -1334,7 +1336,7 @@
  "idx": 146,
  "is_submittable": 1,
  "links": [],
- "modified": "2022-04-26 14:48:08.781837",
+ "modified": "2022-06-10 03:52:04.197415",
  "modified_by": "Administrator",
  "module": "Stock",
  "name": "Delivery Note",