[qa] Make import-rescan.py watchonly check reliable
[qa] Make import-rescan.py watchonly check reliable

Send payments during the test from a different node than the node generating
keys to be imported, so the spending node doesn't create transactions that
inadvertently involve (spend funds from) the imported keys.

Fixes #9826

Github-Pull: #9839
Rebased-From: 864890adf5fefcf969f82f70949199b68b36f165

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