Merge #18610: scripted-diff: test: replace command with msgtype (naming)

9df32e820d83aa74e2f175d8d63b5666b8b4ef0e scripted-diff: test: replace command with msgtype (Sebastian Falbesoner)

Pull request description:

  This is a follow-up PR to https://github.com/bitcoin/bitcoin/pull/18533, which changed the naming of `strCommand` to `msg_type` in the network processing code. The same approach is done here for the function test framework, to get rid of the wrong "command" terminology for network mesage types. (Commands are usually used in the CLI or RPC context, so using the same name in the network message context would only be confusing.)

  The commit was created through the following steps:
  1. search for all occurences of the string "command" within the folder `test/functional`
  ```git grep -i command test/functional > command_finds```
  2. manually sort out all false-positives, i.e. occurences of "command" which describe commands in the correct sense (mostly CLI or RPC related, also some with Socks5)
  3. put the remaining occurences into a scripted-diff (a quite simple one, actually) that renames "command" to "msgtype" in the concerned files.

  The name `msgtype` was intentionally chosen without the underscore `_` as classes beginning with `msg_` define concrete types of messages.

ACKs for top commit:
  MarcoFalke:
    ACK 9df32e820d83aa74e2f175d8d63b5666b8b4ef0e . Makes sense that tests use the same naming as Bitcoin Core. See `NetMsgType` here: https://doxygen.bitcoincore.org/namespace_net_msg_type.html

Tree-SHA512: cd0ee08a382910b7f10ce583acdaf4f8a39f9ba4a22434a914415727eedd98bac538de9bf6633574d5eb86f62558bc8dcb638a3289d99b04f8481f34e7a9a0c7

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