Warnings should be treated as errors in CI

[Youssef1313]

Description of the new feature / enhancement

Currently, the repo builds with many warnings. These should be fixed and warnings should be treated as errors in CI

[davidegiacometti]

Hi @Youssef1313
I have noticed that too even with TreatWarningsAsErrors set.

PowerToys/Directory.Build.props

Line 26 in 54aab5d

<TreatWarningsAsErrors>true</TreatWarningsAsErrors>

[Youssef1313]

PowerToys/src/Common.Dotnet.CsWinRT.props

Line 17 in fe610d4

<WarningsNotAsErrors>CA1720;CA1859;CA2263;CA2022</WarningsNotAsErrors>

Maybe this.