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/demo/user/sales.py

@@ -65,7 +65,7 @@ def work(domain="Manufacturing"):
 def make_opportunity(domain):
 	b = frappe.get_doc({
 		"doctype": "Opportunity",
-		"enquiry_from": "Customer",
+		"opportunity_from": "Customer",
 		"customer": get_random("Customer"),
 		"opportunity_type": "Sales",
 		"with_items": 1,
@@ -108,7 +108,7 @@ def make_quotation(domain):
 			"creation": frappe.flags.current_date,
 			"doctype": "Quotation",
 			"quotation_to": "Customer",
-			"customer": customer,
+			"party_name": customer,
 			"currency": party_account_currency or company_currency,
 			"conversion_rate": exchange_rate,
 			"order_type": "Sales",