[SYCL] Fix 2D slicepitch info

[hdelan]

Make slicePitch equal to image size and numSlices 1 for a 2D image.

This was incorrect but wasn't failing as many backends ignore Pitch[1] for a 2D image.

[maarquitos14]

LGTM

[maarquitos14]

Can we have a test for this?

[hdelan]

I could potentially make a unittest that checks whether a valid slice pitch is passed to the backend. The slice pitch is not exposed to the user for 2D images so the test would need to look at a backend SYCL_UR_TRACE.

[maarquitos14]

I could potentially make a unittest that checks whether a valid slice pitch is passed to the backend. The slice pitch is not exposed to the user for 2D images so the test would need to look at a backend SYCL_UR_TRACE.

unittest works for me! Thanks!

[hdelan]

I've added a test in the E2E tests. There weren't any unittests using SYCL_UR_TRACE as this test does, and only a handful of tests in test so I though test-e2e was the most natural place for these.