The DRC annular ring width test failed to take into account that a pad
could be contained inside another pad having the same number (thermal
vias for example) which changes the effective annular width of the pad
contained within another pad. A test was added to calculate the effective
annular ring width in this case.
Added some PNS log viewer helper and test code to the PNS playground QA
utility for testing the effective pad annular width code.
Fixes https://gitlab.com/kicad/code/kicad/-/issues/17485
a508f2e716