Enable secret_detection_partner_token_verification

What does this MR do and why?

Enable secret_detection_partner_token_verification by default

To validate the impact on self managed customers, we are enabling it by default instead of removing it. We will monitor one more milestone before removing the FF.

References

&16890 (comment 2903892135) Partner Token Verification - Feature Flag and R... (#567736)

Screenshots or screen recordings

Before	After

How to set up and validate locally

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