buffer: add @@toStringTag to Blob

This commit adds the toStringTag to the Blob class to match
the behavior of Chrome and Firefox.

PR-URL: https://github.com/nodejs/node/pull/37336
Fixes: https://github.com/nodejs/node/issues/37337


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>