test: add known_issues test for #6287
Checklist
-
make -j4 test
(UNIX), orvcbuild 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 #6287 (closed):
Deleting property in the vm context has no effect
is added to the known_issues directory.
It will be fixed with the 5.5 V8 API changes