[backport#17437] rpc: Expose block height of wallet transactions

Summary:
a5e77959c8ff6a8bffa1621d7ea29ee8603c5a14 rpc: Expose block height of wallet transactions (João Barbosa)

Pull request description:

Closes #17296.

Backport of Core PR17437

Test Plan:

ninja all check check-functional

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D7712