feat: update to use the universal Nitro binary on MacOS target

[louis-menlo]

Problem
So many if else for the process.arch check, let's simplify

• Update Nitro CI to generate universal binary using lipo create
• Update build script to pull only universal binary file
• Remove process arch check from app's extension

Success Criteria
Removed process arch check logic from app's extension, simplify nitro load & distribute

Additional context
Add any other context or screenshots about the feature request here.