[zip] Improve log messages

Removed option UnzipOptions::log_skipped_files. It wasn't getting set
anywhere. Instead, changed the "skipped entry" log level to VLOG(1).

Improved log messages. Redacted file paths that could be considered PII
in some circumstances.

Changed some debug warning messages to error messages.

BUG=chromium:1303983
TEST=autoninja -C out/Default zlib_unittests && out/Default/zlib_unittests
TEST=autoninja -C out/Default components_unittests && out/Default/components_unittests --gtest_filter='UnzipTest.*'

Change-Id: I2bc5fc7d3dcf5af465faee4bdd4311e244486a9e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3520763


Reviewed-by: Alex Danilo <adanilo@chromium.org>
Commit-Queue: François Degros <fdegros@chromium.org>
Cr-Commit-Position: refs/heads/main@{#980441}
NOKEYCHECK=True
GitOrigin-RevId: f2cb378ae18451b14f0176de16fe4745aead0a9f