Remove additional //testing pylint disables

Removes the following disables from //testing's pylintrc file and fixes
the resulting warnings:
* abstract-method
* broad-except
* invalid-triple-quote
* locally-disabled (disabled by default)
* locally-enabled (removed from Pylint)
* ungrouped-imports

Also documents the reason why we expect to keep several disables around
indefinitely.

Bug: 353942917
Change-Id: Ifd5fce54d3187514ebc8c6a470bb1b55084b82f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5786530
Reviewed-by: Ben Pastene <[email protected]>
Commit-Queue: Ben Pastene <[email protected]>
Auto-Submit: Brian Sheedy <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1342450}
NOKEYCHECK=True
GitOrigin-RevId: 67ff36d082a0b05877b0dd81745e32cd25175917
1 file changed