[docs] [issue18576] Rename and document test.script_helper as test.support.script_helper

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Please left test.script_helper as alias to test.support.script_helper.

I.e. test/script_helper.py should contains something like:

from test.support.script_helper import *

And test this with unmodifiable other tests.

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nosy: +serhiy.storchaka

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