Update on "[ET-VK] Adding more pointwise convolution tests."

This diff adds new test cases for pointwise convolution in the Vulkan backend of Executorch. The updated test cases cover different configurations of convolution layers, including kernel size, padding, stride, and groups.

Differential Revision: [D75961457](https://our.internmc.facebook.com/intern/diff/D75961457/)

[ghstack-poisoned]

Author: trivedivivek