Update mappings based on content changes and add tests for property type validation

app/models/constants/case_log.rb

@@ -698,5 +698,20 @@ module Constants::CaseLog
     "Rent to buy" => "Intermediate Rent",
     "London living rent" => "Intermediate Rent",
     "Other intermediate rent product" => "Intermediate Rent",
+}.freeze
+
+  LET_TYPE = {
+    "Social Rent General needs PRP" => 1,
+    "Social Rent Supported housing PRP" => 2,
+    "Social Rent General needs LA" => 3,
+    "Social Rent Supported housing LA" => 4,
+    "Affordable Rent General needs PRP" => 5,
+    "Affordable Rent Supported housing PRP" => 6,
+    "Affordable Rent General needs LA" => 7,
+    "Affordable Rent Supported housing LA" => 8,
+    "Intermediate Rent General needs PRP" => 9,
+    "Intermediate Rent Supported housing PRP" => 10,
+    "Intermediate Rent General needs LA" => 11,
+    "Intermediate Rent Supported housing LA" => 12,
   }.freeze
 end