[tests][modernize]Make the tests compile with hipSYCL#4

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sbalint98 wants to merge 5 commits intoAdaptiveCpp:masterfrom

sbalint98:tests

Commits on May 21, 2021

Commits on May 31, 2021

[tests][rng] Remove superfluous cl:: qualifications from rng tests
sbalint98
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[tests] use auto instead of cl::sycl::async_handler in tests
sbalint98
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Commits on Jun 2, 2021

Remove useses of ifdefs from the tests
sbalint98
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