tools: add Release and Debug symlinks to .gitignore

Seems at least some windows versions interpret symlinks not as folders
therefore .gitignore needs some extra entries.

PR-URL: https://github.com/nodejs/node/pull/27484
Refs: https://github.com/nodejs/node/pull/27149


Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>