fix: Missing commits from hotfix branch (#17997)

* fix: merge conflict

* fix: restored missing set_gst_state_and_state_number function

* fix: style linting as per codacy

* fix: Fixes related to customer/lead merging

* fix: merge conflict

* fix: Fixes related to customer/lead merging

* fix: Assign isue/opportunity to user

* fix: Assign isue/opportunity to user

* fix: Replaced Invoice type by GST Category

* fix: merge conflict

* fix: merge conflict

* fix: test cases

* fix: test cases

erpnext/controllers/tests/test_mapper.py

@@ -43,7 +43,7 @@ class TestMapper(unittest.TestCase):
 		qtn = frappe.get_doc({
 			"doctype": "Quotation",
 			"quotation_to": "Customer",
-			"customer": customer,
+			"party_name": customer,
 			"order_type": "Sales",
 			"transaction_date" : nowdate(),
 			"valid_till" : add_months(nowdate(), 1)