Merge bitcoin/bitcoin#25986: test: refactor RPCPackagesTest to use MiniWallet

[DashCoreAutoGuix]

Summary

Backport of bitcoin#25986

This PR refactors RPCPackagesTest to use MiniWallet for transaction creation, simplifying the test code and making it more maintainable.

Changes:

• Refactors RPCPackagesTest to use MiniWallet.create_self_transfer() and MiniWallet.create_self_transfer_multi() for transaction creation
• Adds create_self_transfer_chain() method to MiniWallet class
• Adds send_self_transfer_chain() method to MiniWallet class
• Removes the no-longer-needed make_chain, create_child_with_parents, and create_raw_chain functions from wallet.py

Dash-specific adaptations:

• Removed wtxid references as Dash does not support SegWit
• Excluded test_rbf and test_submitpackage tests as they depend on BIP125 RBF and package relay features not present in this version

Original Bitcoin PR: bitcoin#25986
Original commit: 00c323610a

Test Plan

• Build passes
• rpc_packages.py functional test passes
• Other functional tests using MiniWallet continue to work

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📥 Commits

Reviewing files that changed from the base of the PR and between e3d61f2 and 526785f.

📒 Files selected for processing (2)

• test/functional/rpc_packages.py (5 hunks)
• test/functional/test_framework/wallet.py (1 hunks)

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch backport-0.25-batch-488-pr-25986

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