Add star into link attributes (#81407)

Add star into link attributes (#81407)

One of the functionalities of the LinkAttributes files is to occurrences of custom attributes on the current assembly, on top of this functionality there is a special functionality that is only permitted if it's embedded in an XML inside the System.Private.CorLib module that allows the deletion of custom attributes from all the assemblies.
Given that NativeAOT is multithreaded it cannot process all the assemblies to remove attributes as ILLink does, it also does not have a shared storage in which it can store the information about the removed attributes from System.Private.CoreLib.
This PR adds logic to process the special functionality in the embedded System.Private.CoreLib XML every time an assembly is being processed.
In order to make this more performant, an extra argument is passed to the XML reader to only look at the assembly="*" to get the set of attributes that need to be deleted from all assemblies.

* Handle the star argument in LinkAttributes files for NativeAOT
* Minor fixes to print more warnings
* Add a way to only process star/nonstar assemblies in ProcessLinkerXmlBase
* Add smoke test