refactor: remove unused CKey::Negate method
#30218
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This method was introduced as a pre-requirement for the v2 transport protocol back then (see PR bitcoin#14047, commit 463921b), when it was still BIP151. With the replacement BIP324, this is not needed anymore, and it's also unlikely that any other proposal would need to negate private keys at this abstraction level. (If there is really demand, it's trivial to reintroduce the method.)
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This method was introduced as a pre-requirement for the v2 transport protocol back then (see PR #14047, commit 463921b), when it was still BIP151. With the replacement BIP324, this is not needed anymore, and it's also unlikely that for any other proposal we'd ever need to negate private keys at this abstraction level. I'd argue that this operation is usually something that should happen within a secp256k1 module (like e.g. done in MuSig2, Silent Payments...).
(If there is really demand in the future, it's also trivial to reintroduce the method.)