[Executorch][QNN] Improve qualcomm examples

[abhinaykukkadapu]

This PR covers some minor improvements and fixes to help iterate faster with qualcomm example scripts, that i did locally when benchmarking.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15477

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❌ 2 New Failures, 1 Cancelled Job, 2 Unrelated Failures

As of commit eb8e6d4 with merge base 692825d ():

NEW FAILURES - The following jobs have failed:

• pull / unittest / windows / windows-job (gh)
  backends/xnnpack/test/ops/test_conv1d.py::TestConv1d::test_qs8_conv1d_batchnorm_seq
• pull / unittest-editable / windows / windows-job (gh)
  backends/xnnpack/test/ops/test_conv1d.py::TestConv1d::test_qs8_conv1d_batchnorm_seq

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

• pull / test-openvino-linux / linux-job (gh)

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

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

• pull / test-binary-size-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-setup-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[abhinaykukkadapu]

@haowhsu-quic I've updated this PR, can you please take a look when you have a chance. Thanks!

[shewu-quic]

LGTM. Thanks!

[cccclai]

Stamp on behalf of QCOM's approval