[backport#15652] wallet: Move CWallet::ReacceptWalletTransactions locks to callers

Summary:
https://github.com/bitcoin/bitcoin/pull/15652/commits/0440481c6bf5683eff669c789bdf6a306d99adc5

Partial backport of Core PR15652

Test Plan:

ninja check

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D6245