Merge #10500: Avoid CWalletTx copies in GetAddressBalances and GetAddressGroupings

Summary:
b9b814a38 Avoid CWalletTx copies in GetAddressBalances and GetAddressGroupings (Russell Yanofsky)

Tree-SHA512: 96a0612ca460ba1bfb3921f3aa348400fd3afa12c40f2ca1f3f04068b1574fe824d577e0123013d8898a4990084316dc1dfb541331849f0996ceff7f4eb25e6b

Backport of Core PR10500
https://github.com/bitcoin/bitcoin/pull/10500/

Test Plan:

make check
test_runner.py

Reviewers: jasonbcox, Fabien, deadalnix, O1 Bitcoin ABC, #bitcoin_abc

Reviewed By: jasonbcox, O1 Bitcoin ABC, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D3239