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TransferMechanism: fix non-default integrator_function shape mismatch (#3481)

TransferMechanism._parse_function_variable bypassed the
integrator_function, which would fail to update the variable shape of
TransferMechanism.function

This commit causes test result differences in
tests/mechanisms/test_transfer_mechanism.py::TestDistributionFunctions
and
tests/documentation/test_module_docs.py::test_core_docs[psyneulink.core.components.mechanisms.processing.transfermechanism]
due to additional calls to noise functions during TransferMechanism
initialization causing RNG state offset. The new results can be
replicated on the parent commit by manually calling the noise functions
in TransferMechanism._parse_function_variable:

```
     def _parse_function_variable(self, variable, context=None):
         if self.is_initializing:
+            self._try_execute_param(self.parameters.noise._get(context), variable, context)
             return super(TransferMechanism, self)._parse_function_variable(variable=variable, context=context)
```

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