This reverts commit b7efd1611f as there's
no longer a need to authenticate to use these policies.
This unblocks merging into master as `TestPremiumPolicyAuth` is
currently failing.
Since we're removing the capability, it's no longer necessary to
advertise the functionality (even if it did ship previously), so I've
stricken it from the CHANGELOG.md for `3.85.0`.
Fixes#14113
---------
Co-authored-by: Fraser Waters <fraser@pulumi.com>