[#6] YDBSupport hang when gdb used to capture of direct mode process

The hang was fixed by unsetting DEBUGINFOD_URLS before running any program. The fix is inelegant because only gdb is affected. But it was the smallest usable fix, and the script basically needs just to work rather than be elegant.

THe issue was found on an EndeavourOS machine as well as on Ubuntu 24.04 LTS machines. The former has gdb 14.2 and the latter have 15.0.50. Ubuntu 22.04 LTS has 12.1.