[SYCL] Add copy/move ctors and assignment operators to sycl::detail::optional

[Alexandr-Konovalov]

Currently, those are implicitly defined and perform bitwise copy of Storage, that is incorrect if T has non-trivial copy ctors etc.

[aelovikov-intel]

Should this PR remove

llvm/devops/compat_ci_exclude.sycl-rel-6_2

Lines 52 to 59 in 39e2534

	# https://github.com/intel/llvm/pull/18314
	Assert/assert_in_kernels.cpp
	Assert/assert_in_multiple_tus.cpp
	Assert/assert_in_multiple_tus_one_ndebug.cpp
	Assert/assert_in_one_kernel.cpp
	Assert/assert_in_simultaneous_kernels.cpp
	Assert/assert_in_simultaneously_multiple_tus.cpp
	Assert/assert_in_simultaneously_multiple_tus_one_ndebug.cpp

as well?

[Alexandr-Konovalov]

Should this PR remove

llvm/devops/compat_ci_exclude.sycl-rel-6_2

Lines 52 to 59 in 39e2534

	# https://github.com/intel/llvm/pull/18314
	Assert/assert_in_kernels.cpp
	Assert/assert_in_multiple_tus.cpp
	Assert/assert_in_multiple_tus_one_ndebug.cpp
	Assert/assert_in_one_kernel.cpp
	Assert/assert_in_simultaneous_kernels.cpp
	Assert/assert_in_simultaneously_multiple_tus.cpp
	Assert/assert_in_simultaneously_multiple_tus_one_ndebug.cpp

as well?

Sure, missed.

[aelovikov-intel]

@Alexandr-Konovalov , @AlexeySachkov , @KornevNikita , this needs cherry-picking both up/down-stream.

[Alexandr-Konovalov]

@Alexandr-Konovalov , @AlexeySachkov , @KornevNikita , this needs cherry-picking both up/down-stream.

@aelovikov-intel Could you please advise, how can I help with that?

[KornevNikita]

@Alexandr-Konovalov don't worry, I'll do it. Just a cherry-pick to another branch.

@aelovikov-intel could you please add some small clarification comments to these devops/compat_ci_exclude.sycl-rel-* files regarding their purpose?

Do we need to cherry-pick this to both 6.2 and 6.3? Asking because we just published the 6.2.0 release, I guess this branch doesn't assume to get new commits if we don't plan to publish 6.2.1, but I may be wrong. @AlexeySachkov?