Fix #5268: Farble concurrency

[cuba]

Summary of Changes

Farble window.navigator.hardwareConcurrency to be a value between 2 and the true value:

1. Added additional scripts to FarblingProtection.js
2. Added random values injected to that script to farbling protection script in FarblingProtectionHelper.swift

This pull request fixes #5268

Submitter Checklist:

• Unit Tests are updated to cover new or changed functionality
• User-facing strings use NSLocalizableString()

Test Plan:

Test plan can be found in the provided issue.

Screenshots:

N/A

Reviewer Checklist:

• Issues include necessary QA labels:
  • QA/(Yes|No)
  • bug / enhancement
• Necessary security reviews have taken place.
• Adequate unit test coverage exists to prevent regressions.
• Adequate test plan exists for QA to validate (if applicable).
• Issue and pull request is assigned to a milestone (should happen at merge time).