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Suppress DPC++/SYCL header deprecation warnings when building `dpnp.tensor` on Windows (#2993)

Re-land of #2984. That PR was a stacked PR targeting the intermediate
branch `pin-conda-to-avoid-installing-faulty-build`, whose own PR
(#2982) was **closed, not merged**. As a result, #2984 was merged into
that dead intermediate branch and its changes never reached `master`.
GitHub won't allow reopening a merged PR, so this re-lands the identical
change directly against `master`.

This is a follow-up to #2856 and #2770. The `dpnp.tensor` target never
got the same `SYSTEM` treatment, so it was the one target still leaking
these warnings.

The Windows conda build produced a flood of `-Wdeprecated-declarations`
warnings (hundreds of thousands of lines in the CI log). All of them
originate inside the DPC++/SYCL headers themselves
(`.../Library/include/sycl/...`) — none come from dpnp's own sources —
so they are out of dpnp's control and are pure noise. They came
exclusively from the `dpnp.tensor` `_tensor_*_impl` pybind11 modules
built in `dpnp/tensor/CMakeLists.txt`.

In the `dpnp/tensor` target loop, split the include directories so
dpnp's own headers stay `PRIVATE`, and the third-party headers
(`SYCL_INCLUDE_DIR`, `Dpctl_INCLUDE_DIR`, generated Cython headers) are
added as `SYSTEM PRIVATE`, mirroring the pattern established in #2770
for the `backend/extensions/*` targets.

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