Fix PGPainless key parameter validation setup

[DenBond7]

his PR fixes the PGPainless initialization to enable key parameter validation on the policy assigned to the new global PGPainless instance.

Previously, the setup modified the policy of the old global instance, which was discarded immediately afterward. As a result, key parameter validation remained disabled.

The PR also:

• Adds a regression test for the production PGPainless configuration.
• Re-enables testPublicKey_Issue1358() after the resolution of PGPainless issue #488.
• Verifies that the issue 1358 public key can be parsed with production key parameter validation enabled.
• Restores the original global PGPainless instance after each test.

close#3253

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Tests(delete all except exactly one):

• Tests added or updated

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To be filled by reviewers

I have reviewed that this PR... (tick whichever items you personally focused on during this review):

• addresses the issue it closes (if any)
• code is readable and understandable
• is accompanied with tests, or tests are not needed
• is free of vulnerabilities

[sosnovsky]

👍