AssemblyVersion inconsistant across TFMs

### Description

I'm not sure if it is by design or not, but I recently tripped up because the `AssemblyVersion` was not consistent across the different TFMs for some of the Microsoft.Extensions.* packages.

Looking at e.g `Microsoft.Extensions.Logging.Abstractions` and `Microsoft.Extensions.FileProviders.Abstractions` specifically, but I imagine it applies to most if not all packages built this way.

When there are multiple dlls supplied for different TFMs (net8.0, net9.0, net10.0, netstandard2.0, net462) the `AssemblyVersion` attribute does not match between them.

e.g.
```cs
// S:\.nuget\packages\microsoft.extensions.logging.abstractions\10.0.5\lib\netstandard2.0\Microsoft.Extensions.Logging.Abstractions.dll
// Microsoft.Extensions.Logging.Abstractions, Version=10.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60
[assembly: AssemblyFileVersion("10.0.526.15411")]
[assembly: AssemblyInformationalVersion("10.0.5+a612c2a1056fe3265387ae3ff7c94eba1505caf9")]
[assembly: AssemblyTitle("Microsoft.Extensions.Logging.Abstractions")]
[assembly: AssemblyMetadata("RepositoryUrl", "https://github.com/dotnet/dotnet")]
[assembly: AssemblyVersion("10.0.0.0")]
```

```cs
// S:\.nuget\packages\microsoft.extensions.logging.abstractions\10.0.5\lib\net10.0\Microsoft.Extensions.Logging.Abstractions.dll
// Microsoft.Extensions.Logging.Abstractions, Version=10.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60
[assembly: AssemblyFileVersion("10.0.526.15411")]
[assembly: AssemblyInformationalVersion("10.0.5+a612c2a1056fe3265387ae3ff7c94eba1505caf9")]
[assembly: AssemblyTitle("Microsoft.Extensions.Logging.Abstractions")]
[assembly: AssemblyMetadata("RepositoryUrl", "https://github.com/dotnet/dotnet")]
[assembly: AssemblyVersion("10.0.0.0")]
```

```cs
// S:\.nuget\packages\microsoft.extensions.logging.abstractions\10.0.5\lib\net462\Microsoft.Extensions.Logging.Abstractions.dll
// Microsoft.Extensions.Logging.Abstractions, Version=10.0.0.5, Culture=neutral, PublicKeyToken=adb9793829ddae60
[assembly: AssemblyFileVersion("10.0.526.15411")]
[assembly: AssemblyInformationalVersion("10.0.5+a612c2a1056fe3265387ae3ff7c94eba1505caf9")]
[assembly: AssemblyTitle("Microsoft.Extensions.Logging.Abstractions")]
[assembly: AssemblyMetadata("RepositoryUrl", "https://github.com/dotnet/dotnet")]
[assembly: AssemblyVersion("10.0.0.5")]
```

### Reproduction Steps

Use ILSpy or similar to decompile the .dll file from the nuget file downloaded from nuget.org.

Check the assembly name, and the AssemblyVersion attribute.

### Expected behavior

I would expect the AssemblyVersion to be consistent across all the DLLs and only be incremented if the assembly has changes per SemVer rules.

### Actual behavior

The AssemblyVersion in net4x appears to reflect the release - e.g. 10.0.0.5 in the package version 10.0.5, but is 10.0.0.0 in the other TFMs.

### Regression?

_No response_

### Known Workarounds

_No response_

### Configuration

Net 10 SDK. VS2026.

### Other information

_No response_