Clean failed comparisons

[andreasohlund]

Eg https://github.com/ParticularLabs/APIComparer/issues/82

To make sure transient failures won't cause the comparison to fail permanently

Current workaround is to run

(Get-ChildItem *.html | Select-String -Pattern "failed with the following" | Select-Object -ExpandProperty path -Unique) | ForEach-Object{Remove-Item -Force -LiteralPath $_}

Periodically