py2ml: translate `TestScriptHashRegression` of `test_contract.py`

Context

Related: #3942 (closed)

This MR translates the test TestScriptHashRegression of test_contract.py to Tezt.

To ease review and to make the MR both backwards and future-proof w.r.t. the script location migration ongoing in #4008 (closed), this MR:

Translates the test, in a way that the regression trace of the pytest and tezt are very similar, to simplify review. i do not move the scripts from tests_python/contracts_NNN, instead i let tezt read scripts from those locations.

Once #4008 (closed) is fixed, we'll update this test to also take into consideration the set of scripts in michelson_test_scripts.

Manually testing the MR

Checklist

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