[cadence] Glob hifi op-test sources so all op tests are picked up

[aliafzal]

Replace the hardcoded test_op_*.cpp list in the cadence_hifi_op_tests target with file(GLOB CONFIGURE_DEPENDS ...), so any op test added to backends/cadence/hifi/operators/tests/ is compiled and run on the Xtensa ISS automatically without editing the CMakeLists.

No behavior change today (globs the same 10 test files currently present); this just removes the manual per-op list so future op tests are picked up automatically.

[pytorch-bot]

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❌ 3 New Failures, 1 Cancelled Job, 10 Unrelated Failures

As of commit 7d0b60c with merge base 4dc1b5b ():

NEW FAILURES - The following jobs have failed:

• pull / test-binary-size-linux-gcc / linux-job (gh)
  RuntimeError: Command docker exec -t cbcd96d9ad81512846026bf48b475ea01c2a8aad4d523b23ce4b16e81a53d8ab /exec failed with exit code 1
• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t b18452d55c738e433c1077f33d0b260d165d0bf2e9ff492ec2a5af8203c262ea /exec failed with exit code 1
• pull / unittest-editable / linux / linux-job (gh)
  RuntimeError: Command docker exec -t bb91bbf4b4ef9b27de928da5d2ee9ce3e84a3a0cbf0523b8d47d4dc89ed852a7 /exec failed with exit code 1

CANCELLED JOB - The following job was cancelled. Please retry:

• pull / unittest-nxp-neutron / linux-job (gh)

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / test-llama-runner-linux (fp32, xnnpack+custom+quantize_kv, linux.arm64.2xlarge, executorch-ubuntu... / linux-job (gh) (matched linux rule in flaky-rules.json)
  Error response from daemon: Get "https://308535385114.dkr.ecr.us-east-1.amazonaws.com/v2/": context deadline exceeded
• pull / test-llama-runner-linux (fp32, xnnpack+quantize_kv, linux.2xlarge, executorch-ubuntu-22.04-clang12) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128
• pull / test-models-linux-basic (mv3, portable, cmake, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11... / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128
• pull / test-moshi-linux / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128
• pull / test-openvino-linux / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128
• pull / test-parakeet-xnnpack-linux / linux-job (gh) (matched linux rule in flaky-rules.json)
  Error response from daemon: Get "https://308535385114.dkr.ecr.us-east-1.amazonaws.com/v2/": context deadline exceeded
• pull / test-qnn-models-linux (mv3) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128
• pull / test-static-llama-qnn-linux (stories_110m) / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128
• pull / test-vulkan-operators-linux / linux-job (gh) (matched linux rule in flaky-rules.json)
  The process '/usr/bin/git' failed with exit code 128
• Test ARM Backend / test-arm / test-backend-linux (arm_tosa_fp, operators) / linux-job (gh) (matched linux rule in flaky-rules.json)
  Error response from daemon: Get "https://308535385114.dkr.ecr.us-east-1.amazonaws.com/v2/": context deadline exceeded

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