Remove op_linear_scratch_example

[lucylq]

Summary:
Example file that is deprecated. Removing as it has a security vulnerability found by the fuzzer

Heap buffer overflow in linear_scratch_example()

Differential Revision: D88285745

[pytorch-bot]

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@lucylq has exported this pull request. If you are a Meta employee, you can view the originating Diff in D88285745.

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