test: Remove no longer needed MakeChain calls
Summary:
These calls are no longer needed after edc3160
from #19098 which started instantiating BasicTestingSetup.m_node.chain
Co-authored-by: MarcoFalke <falke.marco@gmail.com>
This is a backport of core#19425 [3/3]
https://github.com/bitcoin/bitcoin/pull/19425/commits/5baa88fd38c8efa0e361636bb2c60af89d27b5d5
Depends on D11419
Test Plan: ninja check
Reviewers: #bitcoin_abc, Fabien
Reviewed By: #bitcoin_abc, Fabien
Differential Revision: https://reviews.bitcoinabc.org/D11420