Update base for Update on "[ET-VK] Print op breakdown in tsv format"

Use boolean flag to switch between nicely-formatted space separator and spreadsheet-ready tab operator. Motiviation is similar to #7035 in facilitating copy-paste of results to a gsheet.

Differential Revision: [D68345444](https://our.internmc.facebook.com/intern/diff/D68345444/)

[ghstack-poisoned]

Author: jorgep31415