openvino: Update to OV 2026.2.1, self-contained release packages, operator improvemen...

openvino: Update to OV 2026.2.1, self-contained release packages, operator improvements (llama/24974)

* Update to OV 2026.2.1, Make OV release packages self-contained

* Update to OV 2026.2.1, Make OV release packages self-contained

* OpenVINO Backend: Remove compute_op_type hardcoded sets (llama/222)

* OpenVINO Backend: Remove compute_op_type hardcoded sets

* revert get_op_type removal

* OpenVINO backend: enable softmax with sink input

* OpenVINO backend: opt mul_mat_id convert process for large size

* OpenVINO backend: Modify add_id to support 2D/4D

* OpenVINO Backend: Add glu_swiglu_oai

* PR review: fix paths

* PR review: fix path consistency

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Co-authored-by: Mostafa <redacted>
Co-authored-by: Xuejun <redacted>