8303613: EdECPrivateKey should support Destroyable.destroy()

[driverkt]

This PR is to fix the mentioned bug, but it should also establish a pattern for a larger refactor of similar classes. See also: #25632

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• JDK-8303613: EdECPrivateKey should support Destroyable.destroy() (Enhancement - P4) ⚠️ Issue is not open.

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[driverkt]

This method body might be refactored as part of another PR in a similar fashion, but for now, we just remove the explicit throws.

[driverkt]

This is possible due to the cleaner registered in PKCS8Key and should zero out its fields before doing the subclass's destroy.