[SYCL] Decouple <sycl/builtins.hpp> from <sycl/usm.hpp> (#22312)
<sycl/usm.hpp> transitively pulled in <sycl/builtins.hpp> (and through
it <sycl/half_type.hpp>, <algorithm>, vec/marray definitions, libc
device declarations like __assert_fail, etc.). User code and tests came
to rely on this implicit re-export chain.
Once `sycl_khr_split_headers` ships, <sycl/usm.hpp> is meant to deliver
only USM symbols. Keeping the <sycl/builtins.hpp> include would either
defeat the purpose of split-headers or force a source break later.
Fix the dependency now:
* Drop <sycl/builtins.hpp> and <algorithm> from <sycl/usm.hpp>.
* Replace four unqualified max(...) callsites (which previously resolved
to sycl::max via builtins) with inline ternaries.
* Add the explicit headers each affected test/common helper actually
needs:
- <algorithm> for std::any_of / all_of / find / sort etc.
- <sycl/half_type.hpp> for sycl::half as a complete type.
- <sycl/vector.hpp> for sycl::vec.
- <sycl/marray.hpp> for sycl::marray.
- <sycl/builtins.hpp> for sycl math builtins or device-side
assert / libc declarations.
