Native (CL compiler) PDB files not copied into output unless ConfigurationName is Debug

`_DebugSymbolsProduced` internal variable controls whether PDB files are copied from build folder into output folder after build is completed.

This variable is set in:
https://github.com/Microsoft/msbuild/blob/master/src/Tasks/Microsoft.Common.CurrentVersion.targets#L145-L151

There are .NET compiler specific conditions using `DebugType`, but it does not check CL specific conditions like `'$(DebugInformationFormat)'!='none' `, thus regardless of what/if CL if producing PDB, only condition applicable to CL is first generic (wrong?) one:
~~~xml
true
...
<_DebugSymbolsProduced Condition="'$(DebugSymbols)'=='true'">true
~~~
Such behavior is wrong in principle, as it makes some assumptions on configuration name, see #2170.

This also related to:
- https://github.com/Microsoft/msbuild/pull/379
- https://github.com/Microsoft/msbuild/issues/2170
- https://github.com/Microsoft/msbuild/issues/2169

Start in src/Tasks/Microsoft.Common.CurrentVersion.targets at the _DebugSymbolsProduced definition around lines 145-151, then trace how CL uses DebugInformationFormat versus the generic DebugSymbols conditions. Reproduce a native build with a non-Debug ConfigurationName and PDB generation enabled; done means the produced PDB is copied to the output without relying on the configuration name.

Written by the indexing model from the issue text.