fix(privacy-protocols): clear NSUserDefaults on load and reload

[jboileau99]

Description of this change

This mirrors a change made in ketch-android to clear privacy protocol key-value pairs when loading/reloading the SDK.

USPrivacy string:

USPrivacy:

TCF + GPP + USPrivacy:

GPP + USPrivacy:

Why is this change being made?

• Chore (non-functional changes)
• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How was this tested? How can the reviewer verify your testing?

• Tested by changing between jurisdictions having the privacy protocol combinations shown above, and then ensuring that the old keys are deleted

Related issues

Checklist

• I have added tests to cover my changes.
• All new and existing tests passed.
• I have evaluated the security impact of this change, and OWASP Secure Coding Practices have been observed.
• I have informed stakeholders of my changes.