Replace info prints with debug for neutron backend runtime

[irtrukhina]

Summary

Remove info prints from neutron backend runtime as they affect inference duration.

Test plan

Tested locally on real board

cc @robert-kalmar @JakeStevens @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18366

• 📄 Preview Python docs built from this PR

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❌ 2 Cancelled Jobs, 2 Unrelated Failures

As of commit 7368d4a with merge base 2165b5a ():

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• Check Labels / Check labels (gh)
• periodic (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 / 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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[robert-kalmar]

Internal build link: https://bamboo3.sw.nxp.com/browse/MLTECE-EXIGH114