Remove protected-access disable from //testing

Removes protected-access from the list of disabled checks in
//testing's pylintrc file and fixes/suppresses found issues.

Requires crrev.com/c/5792034 to land and roll first.

Bug: 353942917
Change-Id: I199557a27c3b0ddd127c40fca60aa6dfc7b1037c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5791830
Reviewed-by: Kentaro Hara <[email protected]>
Reviewed-by: Ben Pastene <[email protected]>
Commit-Queue: Brian Sheedy <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1348412}
NOKEYCHECK=True
GitOrigin-RevId: d776270bcf4c6df7a5f63004c46328a75a294a2b
2 files changed