Add extension/llm/custom_ops/spinquant/test to CMake

[swolchok]

Need to run it to make sure build changes in this directory aren't breaking things.

Test Plan: added EXPECT_TRUE(false) to fast_hadamard_transform_test.cpp, saw failure in test/run_oss_cpp_tests.sh

[swolchok]

Stack from ghstack (oldest at bottom):

• build_variables.bzl: split PLATFORM_SRCS from EXECUTORCH_CORE_SRCS #8398
• build_variables.bzl: split PROGRAM_NO_PRIM_OPS_SRCS from EXECUTORCH_CORE_SRCS #8397
• create and validate build_variables.bzl #8326
• determine fht_avx.c/fht_neon.c based on CMake target processor #8346
• -> Add extension/llm/custom_ops/spinquant/test to CMake #8345

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/8345

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❌ 1 New Failure

As of commit a826c40 with merge base e74b141 ():

NEW FAILURE - The following job has failed:

• pull / android / build-llm-demo / linux-job (gh)
  RuntimeError: Command docker exec -t 5c96ae843aa2f9ed6e08cd11ac757b9b5b7eaf02c1bcfe6f0e49b019a0a9e8f2 /exec failed with exit code 1

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[swolchok]

this isn't correct yet; test doesn't run when I run test/run_oss_cpp_tests.sh and I'm not sure why yet.