Question about test cases distribution between FULL and non-FULL modes

Hi folks,

We have been working on support for SYCL 2020 specialization constants in our SYCL implementation at intel/llvm and we have realized that unless you switch into `FULL` mode, you are missing a huge piece of data type coverage for `test_specialization_constants`. In particular, we do not test `vec` and `marray` data types in non-`FULL` mode at all in those tests.

Therefore, I was wondering if there are some guideline about how CTS should be written to ensure meaningful coverage in both `FULL` and non-`FULL` modes? Do we need to explicitly document the distribution in [test plans](test_plans/)?

Start by reviewing test_specialization_constants in FULL and non-FULL modes, then inspect the related guidance and test plans under test_plans/. The issue does not define a documentation change or an agreed distribution policy; a maintainer decision would be needed before a newcomer could identify the required edits or completion criteria.

Written by the indexing model from the issue text.