Task: Clean up tests and ObjC/Linux specific code

[surpher]

❕ Problem Statement

surpher/PactSwift exposes Objective-C interface and supports using this framework on Linux platforms.

💬 Task Description

Go through the code and remove any ObjC and Linux support. Most of it has already been done though.

👩‍🔧 Technical Design Notes

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🤝 Relationships

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