[FIX]Ruff: lint errors for E731 (#13018)

api/.ruff.toml

     "E712", # true-false-comparison
     "E721", # type-comparison
     "E722", # bare-except
-    "E731", # lambda-assignment
     "F821", # undefined-name
     "F841", # unused-variable
     "FURB113", # repeated-append

api/models/workflow.py

 
         # decrypt secret variables value
         def decrypt_func(var):
-            return (
-                var.model_copy(update={"value": encrypter.decrypt_token(tenant_id=tenant_id, token=var.value)})
-                if isinstance(var, SecretVariable)
-                else var
-            )
+            if isinstance(var, SecretVariable):
+                return var.model_copy(update={"value": encrypter.decrypt_token(tenant_id=tenant_id, token=var.value)})
+            else:
+                return var
 
         results = list(map(decrypt_func, results))
         return results
 
         # encrypt secret variables value
         def encrypt_func(var):
-            return (
-                var.model_copy(update={"value": encrypter.encrypt_token(tenant_id=tenant_id, token=var.value)})
-                if isinstance(var, SecretVariable)
-                else var
-            )
+            if isinstance(var, SecretVariable):
+                return var.model_copy(update={"value": encrypter.encrypt_token(tenant_id=tenant_id, token=var.value)})
+            else:
+                return var
 
         encrypted_vars = list(map(encrypt_func, value))
         environment_variables_json = json.dumps(