[backport#16689 2/2] Add missing fields in TransactionDescriptionString and others

Summary:
Fields involvesWatchonly, generated, walletconflicts were missing
in result description of listtransactions, listsinceblock,
gettransaction

Align getttransaction fields which were odd compare to other rpc
helpers

https://github.com/bitcoin/bitcoin/pull/16689/commits/f4c8953b0073e6bc37abd18ec4a5cbc3ea9719a1

Depends on D7384

Concludes backport of Core PR16689

Test Plan:

ninja
bitcoin-cli help listreceivedbyaddress|listreceivedbylabel|listtransactions|listsinceblock|gettransaction

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D7385