Printing: Update device log levels

This change makes the following update to log levels to improve
reporting in feedback reports:
- Increase extension printing logs to EVENT to ensure extension printer
  loading times can be tracked via feedback reports.

Bug: b/318577693
Change-Id: I5860e0d64589a7b0251ba39ca46a2d4f5a28e576
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5606676


Commit-Queue: Gavin Williams <gavinwill@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1313065}