Task: Clean up tests and ObjC/Linux specific code

# ❕ 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

- Other Related Issues:
