minor code fix: remove duplicate hash calculation and fix typo

api/core/workflow/entities/variable_pool.py

@@ -152,7 +152,6 @@ class VariablePool(BaseModel):
             self.variable_dictionary[selector[0]] = {}
             return
         key, hash_key = self._selector_to_keys(selector)
-        hash_key = hash(tuple(selector[1:]))
         self.variable_dictionary[key].pop(hash_key, None)
 
     def convert_template(self, template: str, /):

api/tests/unit_tests/core/variables/test_segment.py

@@ -376,7 +376,7 @@ class TestSegmentDumpAndLoad:
                 f"get_segment_discriminator failed for serialized form of type {type(variable)}"
             )
 
-    def test_invlaid_value_for_discriminator(self):
+    def test_invalid_value_for_discriminator(self):
         # Test invalid cases
         assert get_segment_discriminator({"value_type": "invalid"}) is None
         assert get_segment_discriminator({}) is None