[qa] Test for duplicate inputs within a transaction

Summary:
Co-authored-by: Suhas Daftuar <sdaftuar@gmail.com>

https://github.com/bitcoinxt/bitcoinxt/pull/486
https://github.com/bitcoin/bitcoin/pull/14247

Test Plan: test_runner.py invalidblockrequest.py

Reviewers: #bitcoin_abc, jasonbcox

Reviewed By: #bitcoin_abc, jasonbcox

Subscribers: jasonbcox, teamcity

Differential Revision: https://reviews.bitcoinabc.org/D1793