Update on "[ET-VK] Simplifying conv1d op shader by changing it to process one output texel per thread."

This diff changes conv1d shader to process one output texel per thread, increasing GPU occupancy and improve performance.

Differential Revision: [D74097560](https://our.internmc.facebook.com/intern/diff/D74097560/)

[ghstack-poisoned]

Author: trivedivivek