Merge bitcoin/bitcoin#28996: test: maxuploadtarget: check for mempool msg disconnect if limit is reached, improve existing test coverage

b58f009d9585aab775998644de07e27e2a4a8045 test: check that mempool msgs lead to disconnect if uploadtarget is reached (Sebastian Falbesoner)
dd5cf38818d1e3f6cf583e2b242afd0da68b290a test: check for specific disconnect reasons in feature_maxuploadtarget.py (Sebastian Falbesoner)
73d737211536de5b834f21016c5549e52de11374 test: verify `-maxuploadtarget` limit state via `getnettotals` RPC result (Sebastian Falbesoner)

Pull request description:

  This PR improves existing and adds new test coverage for the `-maxuploadtarget` mechanism (feature_maxuploadtarget.py) in the following ways, one commit each:
  * verify the uploadtarget state via the `getnettotals` RPC (`uploadtarget` result field):
  https://github.com/bitcoin/bitcoin/blob/160d23677ad799cf9b493eaa923b2ac080c3fb8e/src/rpc/net.cpp#L581-L582
  Note that reaching the total limit (`target_reached` == True) always implies that the historical blocks serving limits is also reached (`serve_historical_blocks` == False), i.e. it's impossible that both flags are set to True.

  * check for peer's specific disconnect reason (in this case, `"historical block serving limit reached, disconnect peer"`):
  https://github.com/bitcoin/bitcoin/blob/160d23677ad799cf9b493eaa923b2ac080c3fb8e/src/net_processing.cpp#L2272-L2280

  * add a test for a peer disconnect if the uploadtarget is reached and a `mempool` message is received (if bloom filters are enabled):
  https://github.com/bitcoin/bitcoin/blob/160d23677ad799cf9b493eaa923b2ac080c3fb8e/src/net_processing.cpp#L4755-L4763
  Note that another reason for disconnect after receiving a MEMPOOL msg of a peer is if bloom filters are disabled on the node. This case is already covered in the functional test `p2p_nobloomfilter_messages.py`.

ACKs for top commit:
  maflcko:
    lgtm ACK b58f009d9585aab775998644de07e27e2a4a8045
  achow101:
    ACK b58f009d9585aab775998644de07e27e2a4a8045
  sr-gi:
    tACK [b58f009](https://github.com/bitcoin/bitcoin/commit/b58f009d9585aab775998644de07e27e2a4a8045)

Tree-SHA512: 7439134129695c9c3a7ddc5e39f2ed700f91e7c91f0b7a9e0a783f275c6aa2f9918529cbfd38bb37f9139184e05e0f0354ef3c3df56da310177ec1d6b48b43d0

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