Enabling optix ci pipeline (#7311)

* Revert "Disable OptiX tests by default. (#1331)"

This reverts commit e45f8c1f49855cebe90b6722324ec24146ff5a3d.

* Enable optix submodule to build

Add support for default entry points in compilation

Implemented logic to check for defined entry points in the module
when no explicit entry points are provided. If found, these entry points
are added to the `specializedEntryPoints` list, with the assumption that
no specialization is needed for them at this time.

* Disable optix if cuda is not enabled

* Add submodule OptixSDK path in search

* Distinguish user-explicit vs auto-detected SLANG_ENABLE_OPTIX

When SLANG_ENABLE_OPTIX is explicitly set by user and CUDA is not available,
show SEND_ERROR to maintain strict validation. When OptiX is auto-detected
(e.g., local submodule present) but CUDA unavailable, gracefully disable
with STATUS message to allow builds to continue.

This addresses review feedback to keep error for explicit requests while
handling auto-detection gracefully.

* Apply CMake formatting to SLANG_ENABLE_OPTIX validation logic

* revert: slang-rhi changes
as those are merged independently as in PR # slang-rhi#400

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