Merge #15246: qa: Add tests for invalid message headers

Summary:
fa3745bda84d5b3a26fdf8af4ac44d6088e11eee qa: Add tests for invalid message headers (MarcoFalke)

Pull request description:

Tree-SHA512: b37e297cfd65a33a7af201f750a303cf437b438e40d38b1d2f562ccde67082616daa110ca1e5e3af6514ea4ca4b115362acf2ffa6263cea3c8e8189ce02dda67

Backport of Core PR15246

Test Plan: ninja check check-functional

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D6394