Prevent invalid scopes request from crashing debug session (#2026)

* Prevent invalid scopes request from crashing debug session

If an unmapped or non-numeric frameId is sent in a scopes request,
int() raises a ValueError that terminates the debug session. Wrap the
scope construction in a try/except so that invalid frameIds return an
empty scopes list instead, which is valid per the DAP spec.

* Add logging for invalid scopes requests

Log expected errors (ValueError, TypeError) at info level and
unexpected exceptions with full traceback via pydev_log.exception.