Merge bitcoin/bitcoin#25379: test: use MiniWallet to simplify mempool_package_limits.py tests

f2f6068b69b1b532db92b276f024c89b56f38294 test: MiniWallet: add `send_self_transfer_chain` to create chain of txns (Andreas Kouloumos)
1d6b438ef0ccd05e1522ac38b44f847c1d93e72f test: use MiniWallet to simplify mempool_package_limits.py tests (Andreas Kouloumos)

Pull request description:

  While `wallet.py` includes the MiniWallet class and some helper methods, it also includes some methods that have been moved there without having any direct relation with the MiniWallet class. Specifically `make_chain`, `create_child_with_parents` and `create_raw_chain` methods that were extracted from `rpc_packages.py` at f8253d69d6f02850995a11eeb71fedc22e6f6575 in order to be used on both `mempool_package_limits.py` and `rpc_packages.py`.

  Since that change, due to the introduction of additional methods in MiniWallet, the functionality of those methods can now be replicated with the existing MiniWallet methods and simultaneously simplify those tests by using the MiniWallet.

  This PR's goals are

  -  to simplify the `mempool_package_limits.py` functional tests with usage of the MiniWallet.
  -  to make progress towards the removal of the `make_chain`, `create_child_with_parents` and `create_raw_chain` methods of `wallet.py`.

  For the purpose of the aforementioned goals, a helper method `MiniWallet.send_self_transfer_chain` is introduced and method `bulk_transaction` has been integrated in `create_self_transfer*` methods using an optional `target_weight` option.

ACKs for top commit:
  MarcoFalke:
    ACK f2f6068b69b1b532db92b276f024c89b56f38294 👜

Tree-SHA512: 3ddfa0046168cbf7904ec6b1ca233b3fdd4f30db6aefae108b6d7fb69f34ef6fb2cf4fa7cef9473ce1434a0cc8149d236441a685352fef35359a2b7ba0d951eb

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