test: add known_issues test for #5350

Checklist

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

Affected core subsystem(s)

tests

Description of change

A test addressing subproblem of #5350 (closed) inherited properties flattened in the vm.runInNewContext is added to the known_issues directory. It will be fixed with the 5.5 V8 API changes

#5350 (closed) is a consequence of the above as flattening of sandbox inherited properties happens first inside the vm context and is subsequently translated onto the outer sandbox. assert.strictEqual(sandbox.hasOwnProperty('propBase'), false);