Remove direct bitcoin calls from qt/rpcconsole.cpp

Summary:
Partial backport of Core PR 10244
https://github.com/bitcoin/bitcoin/pull/10244/commits/582daf6d22da5394d02a12003b9542d9f5865ae2
Progress towards T417
Depends on D2822

Test Plan:
make check
ninja check
bitcoin-qt # sanity checks + ban table renders as expected

Reviewers: deadalnix, Fabien, #bitcoin_abc

Reviewed By: Fabien, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D2845