[Bug]: Python emitter uses mangled name when making requests if parameter name matches method in Mapping protocol

[johanste]

Describe the bug

It looks like the name mangling/avoiding name conflict with base mapping protocol for models leak out to how we build request bodies.

Reproduction

@service
namespace MyService;

op doSomething(items: string[]): void;

Emit python. Look at request body. Uses items_property as the key on the wire.

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