ResolveComReference task should support PublicSign

Currently ResolveComReference accepts KeyFile and DelaySign parameters:
https://github.com/Microsoft/msbuild/blob/518c2fb4bd8621fe0d97e8a233f9ae9599d4b8d4/src/Tasks/Microsoft.Common.CurrentVersion.targets#L2734

However if a project specifies DelaySign=false and PublicSign=true then the project that has a ComReference such as:

```


{EAB22AC0-30C1-11CF-A7EB-0000C05BAE0B}
1
1
0
tlbimp
False
True


```

Fails the build with:

```
SHDocVw error MSB3299: The key file 'f:\agent\FinalPublicKey.snk' does not contain a public/private key pair.[f:\agent\Test.csproj]
```

because the .snk only contains the public key.