Fix generate_nested_dictionary_case integration test failure for Rust cases

[viirya]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

Part of #1404. This is for generate_nested_dictionary_case, Rust producing, Rust consuming case.

Currently running archery --debug integration --run-flight --with-cpp=false --with-rust=true, you will get some errors:

dictionary value type: List(Field { name: "str_dict", data_type: Dictionary(Int8, Utf8), nullable: true, dict_id: 0, dict_is_ordered: false, metadata: None })
Error: JsonError("Unable to find any dictionaries for field Field { name: \"str_dict\", data_type: Dictionary(Int8, Utf8), nullable: true, dict_id: 0, dict_is_ordered: false, metadata: None }")

Note: for other cases like C++ producing, Rust consuming case by enabling it with --with-cpp=true, I've not figured out how to fix it yet. The IPC format seems inconsistent. I will open another issue to deal with it.

Describe the solution you'd like
Running archery --debug integration --run-flight --with-cpp=false --with-rust=true should pass with 0 failure.

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