[PT FE] support aten::kthvalue

[mahdi-jfri]

Details:

• First apply TopK with sorted values, then gather the kth index.

Tickets:

• [Good First Issue]: Support aten::kthvalue #29702

[mahdi-jfri]

@mvafin @PiotrKrzem Hi! This has been awaiting a review for a while now. Any suggestions?

[Copilot]

Pull Request Overview

This PR adds support for the PyTorch aten::kthvalue operation by implementing translation logic that uses TopK with sorted values followed by gathering the kth index.

• Implements translate_kthvalue function using TopK operation with MIN mode and value sorting
• Adds comprehensive test coverage for various shapes, dimensions, and data types
• Registers the new operation in the PyTorch frontend operation table

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
tests/layer_tests/pytorch_tests/test_kthvalue.py	Adds comprehensive test suite for kthvalue operation with parametrized test cases
src/frontends/pytorch/src/op_table.cpp	Registers the translate_kthvalue function and maps aten::kthvalue operation
src/frontends/pytorch/src/op/kthvalue.cpp	Implements the core translation logic using TopK and Gather operations

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[mvafin]

Looks good

[mvafin]

build_jenkins