Assert that RPCArg names are equal to CRPCCommand ones (rawtransaction)

Summary:
This is a backport of core#19849 [2/2]
https://github.com/bitcoin/bitcoin/pull/19849/commits/fa6bb0ce5dba33970e2c1e47ea4d0d2c0718eccb

Test Plan: ninja all check-all

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D10299