Add needed extension and feature checks in mismatched_write_op test

Add needed extension and feature checks in mismatched_write_op test

This change adds required extension and feature checks for the extensions
and capabilites used by the shader in this test.

Moreover, this change removes enabling of SPV_EXT_shader_image_int64
extension where not needed, so some test cases would run on implementations
not supporting it.

VK-GL-CTS Issue: 2796

Affects: dEQP-VK.image.mismatched_write_op.*

Components: Vulkan
Change-Id: I8cd908048e97c65f667b50f7fd9b52d937184608