[backport#14047 4/4] QA: add test for HKDF HMAC_SHA256 L32

Summary:
https://github.com/bitcoin/bitcoin/pull/14047/commits/8794a4b3ae4d34a4cd21a7dee9f694eef7726a4f

Depends on D7395

Partial backport of Core PR14047

Test Plan:

ninja check-bitcoin-crypto_tests

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D7396