CmdPal: Our FastUpToDate check no longer works

[zadjii-msft]

1. Build Microsoft.CmdPal.UI
2. change nothing
3. Build it again

expected:
nothing should build, and it should immediately complete the build

actual:
it builds the project again, which is not quick

This makes the debugging inner loop much slower.

I noticed this probably back in ~early 0.91. Usually this is due to some content file not having the right CopyToOutputDirectory properties set.

[zadjii-msft]

I'd also look at: zadjii-msft@9eeae1e

I'm guessing this regressed in #38085. Or maybe it's the

    <None Include="Assets\TimeDate.png" />

that's the only file that's got a None Include rather than Remove