Merge bitcoin/bitcoin#22271: fuzz: Assert roundtrip equality for CPubKey

9550dff fuzz: Assert roundtrip equality for `CPubKey` (Sebastian Falbesoner)

Pull request description:

  This PR is a (quite late) follow-up to #19237 (bitcoin/bitcoin#19237 (comment)). Looking at `CPubKey::Serialize` and `CPubKey::Unserialize` I can't think of a scenario where the roundtrip (serialization/deserialization) equality wouldn't hold.

ACKs for top commit:
  jamesob:
    crACK bitcoin/bitcoin@9550dff pending CI

Tree-SHA512: 640fb9e777d249769b22ee52c0b15a68ff0645b16c986e1c0bce9742155d14f1be601e591833e1dc8dcffebf271966c6b861b90888a44aae1feae2e0248e2c55

Author: MarcoFalke

src/test/fuzz/deserialize.cpp

@@ -136,8 +136,7 @@ FUZZ_TARGET_DESERIALIZE(partial_merkle_tree_deserialize, {
 FUZZ_TARGET_DESERIALIZE(pub_key_deserialize, {
         CPubKey pub_key;
         DeserializeFromFuzzingInput(buffer, pub_key);
-        // TODO: The following equivalence should hold for CPubKey? Fix.
-        // AssertEqualAfterSerializeDeserialize(pub_key);
+        AssertEqualAfterSerializeDeserialize(pub_key);
 })
 FUZZ_TARGET_DESERIALIZE(script_deserialize, {
         CScript script;