Make DAC return Module instead of PEAssembly for DacpModuleData::PEAssembly

[elinor-fung]

Avoid exposing PEAssembly in the DAC APIs. Make DacpModuleData::PEAssembly and DacpGetModuleData::PEAssembly be the Module instead and update the GetPEFileName and GetPEFileBase to expect a module address.

Contributes to #99302. We want to avoid exposing PEAssembly at all in the cDAC.

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[jkotas]

Could you please also make a matching change to SOS to stop printing PEAssembly so that it does not cause confusion?

https://github.com/dotnet/diagnostics/blob/842c9603a97cf417814cf6c8d96e5c881025bf0e/src/SOS/Strike/strike.cpp#L3969

PEAssembly is not particular useful Module detail. It can be trivially fetched by regular windbg/lldb data inspection commands.