refactor(test): remove explicit sql delete calls

(cherry picked from commit b16dd3f2dd)

erpnext/selling/doctype/customer/test_customer.py

@@ -137,12 +137,6 @@ class TestCustomer(ERPNextTestSuite):
 		# delete communication linked to these 2 customers
 
 		new_name = "_Test Customer 1 Renamed"
-		for name in ("_Test Customer 1", new_name):
-			frappe.db.sql(
-				"""delete from `tabComment`
-				where reference_doctype=%s and reference_name=%s""",
-				("Customer", name),
-			)
 
 		# add comments
 		comment = frappe.get_doc("Customer", "_Test Customer 1").add_comment(
@@ -209,8 +203,6 @@ class TestCustomer(ERPNextTestSuite):
 		so.save()
 
 	def test_duplicate_customer(self):
-		frappe.db.sql("delete from `tabCustomer` where customer_name='_Test Customer 1'")
-
 		if not frappe.db.get_value("Customer", "_Test Customer 1"):
 			test_customer_1 = frappe.get_doc(get_customer_dict("_Test Customer 1")).insert(
 				ignore_permissions=True

erpnext/selling/report/sales_analytics/test_analytics.py

@@ -11,8 +11,6 @@ from erpnext.tests.utils import ERPNextTestSuite
 
 class TestAnalytics(ERPNextTestSuite):
 	def test_sales_analytics(self):
-		frappe.db.sql("delete from `tabSales Order` where company='_Test Company 2'")
-
 		create_sales_orders()
 
 		self.compare_result_for_customer()