Deduplicate deprecation tests

Summary: Some of the deprecation tests are currently duplicated between 2 different functional tests. This diffs moves all the test deprecated fields into rpc_deprecated where they belong, also adding a missing case.

Test Plan:

ninja check-functional

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Differential Revision: https://reviews.bitcoinabc.org/D10802