CMP: Implement GPP interim solution

[akinsola-guardian]

What are you changing?

• Adding __gpp stub to the window element
• Using __gpp('ping') to get SaleOptOut to determine the doNotSell for ccpa.
• Update sourcepoint config to use usnat param.

Why?

[changeset-bot]

⚠️ No Changeset found

Latest commit: 715e87c

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