Merge bitcoin/bitcoin#28136: refactor: move GetServicesNames from rpc/util.{h,cpp} to rpc/net.cpp

bbb68ffdbd refactor: drop protocol.h include header in rpc/util.h (Jon Atack)
1dd62c5295 refactor: move GetServicesNames from rpc/util.{h,cpp} to rpc/net.cpp (Jon Atack)

Pull request description:

  Move `GetServicesNames()` from `rpc/util` to `rpc/net.cpp`, as it is only called from that compilation unit and there is no reason for other ones to need it.

  Remove the `protocol.h` include in `rpc/util.h`, as it was only needed for `GetServicesNames()`, drop an unneeded forward declaration (the other IWYU suggestions would require more extensive changes in other files), and add 3 already-missing include headers in other translation units that are needed to compile without `protocol.h` in `rpc/util.h`, as `protocol.h` includes `netaddress.h`, which in turn includes `util/strencodings.h`.

ACKs for top commit:
  kevkevinpal:
    lgtm ACK [bbb68ff](bbb68ffdbd)
  ns-xvrn:
    ACK bbb68ff
  achow101:
    ACK bbb68ffdbd

Tree-SHA512: fcbe195874dd4aa9e86548685b6b28595a2c46f9869b79b6e2b3835f76b49cab4bef6a59c8ad6428063a41b7bb6f687229b06ea614fbd103e0531104af7de55d

src/rpc/util.h

@@ -9,7 +9,6 @@
 #include <consensus/amount.h>
 #include <node/transaction.h>
 #include <outputtype.h>
-#include <protocol.h>
 #include <pubkey.h>
 #include <rpc/protocol.h>
 #include <rpc/request.h>
@@ -60,7 +59,6 @@ extern const std::string UNIX_EPOCH_TIME;
 extern const std::string EXAMPLE_ADDRESS[2];
 
 class FillableSigningProvider;
-class CPubKey;
 class CScript;
 struct Sections;
 
@@ -133,9 +131,6 @@ std::pair<int64_t, int64_t> ParseDescriptorRange(const UniValue& value);
 /** Evaluate a descriptor given as a string, or as a {"desc":...,"range":...} object, with default range of 1000. */
 std::vector<CScript> EvalDescriptorStringOrObject(const UniValue& scanobject, FlatSigningProvider& provider, const bool expand_priv = false);
 
-/** Returns, given services flags, a list of humanly readable (known) network services */
-UniValue GetServicesNames(ServiceFlags services);
-
 /**
  * Serializing JSON objects depends on the outer type. Only arrays and
  * dictionaries can be nested in json. The top-level outer type is "NONE".