test: add unit test for non-standard txs with too large scriptSig

Summary:

The function IsStandardTx() returns rejection reason "scriptsig-size" if any
one the inputs' scriptSig is larger than 1650 bytes.

This is a backport of Core PR17480

Test Plan: ninja && ninja check

Reviewers: O1 Bitcoin ABC, #bitcoin_abc, Fabien

Reviewed By: O1 Bitcoin ABC, #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D8264