fix(rpc datasource): handle correctly simple action response

[arnaud-moncel]

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Note

Fix execute in RPC datasource collection to symbolize keys in action responses

Adds symbolize_keys: true to the @client.call_rpc call in Collection#execute so that action responses are returned with symbol keys (including :type) instead of string keys. Two new specs in collection_spec.rb verify that the option is passed and that the result is returned unchanged.

^{Macroscope summarized 9508918.}