[Dynamic Selection] Refactor tests to account for offsets

[AnuyaWelling2801]

Realized that the fixed resource tests for both sycl and inline backends did not account for offsets. Fixed it by creating two new files in test/support for tests with and without offsets

[SergeyKopienko]

Looks like we have a lot of duplicated code in the files

• test/support/test_dynamic_selection_offset_utils.h
• test/support/test_dynamic_selection_utils.h

And one significant diff between them that I found is:

• my_policy_t p{u}; <-> my_policy_t p(u, offset);
• auto test_resource = f(i); <-> auto test_resource = f(i, offset);
• may by something else...

But I believe we have a lot of patterns to avoid this code duplications and to have only one copy of this code.

[SergeyKopienko]

@AnuyaWelling2801 Looks like we have some type which declared but never tested:

template <typename Policy>
using wait_t = typename policy_traits<Policy>::wait_type;

I mean wait_t type.

Could you please use this type in tests too?

May be instead of return typename oneapi::dpl::experimental::policy_traits<Policy>::wait_type{}; or somewhere else...