test: added test for indexed properties - #11769

Currently, indexed properties are correctly copied
onto the sandbox by CopyProperties().
This will break when CopyProperties() is removed
after adjusting NamedPropertyHandlerConfiguration
config() to use property callbacks from the new
V8 API. To fix it, we will set a config for indexed
properties.

This test is a preparation step for the patch
that removes CopyProperties().

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• commit message follows commit guidelines

Affected core subsystem(s)

test