build: delete snapshot.blob file from the project

The `snapshot.blob` file landed while backporting
2c0f7d4
in the v18.x release line, but is not required

Fixes: #46133
PR-URL: #46626
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>

Author: juanarbol