[SYCL] Confirm support for nested arrays after struct decomposition complete in PR#1877

[elizabethandrews]

Support for 'top-level' arrays is added in #1841. Nested arrays however are not supported.

Nested arrays are expected to work once PR #1841 is merged with with #1877 - a PR which redesigns kernel parameter passing for struct fields.

This issue is filed to ensure nested array support is handled in PR#1877 and corresponding tests marked as XFAIL are enabled.