Qualcomm AI Engine Direct - UT fix

[winskuo-quic]

Summary

Currently we run UT like the following:
python backends/qualcomm/tests/test_qnn_delegate.py -k TestQNNQuantizedUtils --model SM8750 --device ed8bb642 --build_folder build-android
This runs all tests under TestQNNQuantizedUtils. However, if the first test sets attributes like TestQNN.enable_profile=True, this will get carry over to rest of the tests and all tests will have enable_profile equals to True, which is not desired. This change takes advantage is setup function in UT to reset attributes back to False between executions.

Test plan

Passing all Utils tests under executorch/backends/qualcomm/tests/test_qnn_delegate.py

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18787

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✅ You can merge normally! (2 Unrelated Failures)

As of commit f584c35 with merge base 137dedc ():

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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