GenApi generate wrong interface when passing wrong --assembly-reference path

[tarekgh]

Describe the bug

When running the GenAPI tool to generate the interfaces from assembly and passing wrong path with the --assembly-reference option, it is possible to generate the readonly struct as sealed class. It generates some warnings for not finding some of the runtime assemblies, but it doesn't fail to generate the interfaces. Users can easily ignore the produced warnings as the tool already generated the interfaces.

To Reproduce

Run a command like:

genapi --assembly c:\oss\machinelearning\artifacts\bin\Microsoft.ML.Tokenizers\Release\net8.0\Microsoft.ML.Tokenizers.dll --assembly-reference "c:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\8.0.3\ref\net8.0" --assembly-reference c:\Users\ericstj\.nuget\packages\google.protobuf\3.24.3\lib\net5.0

The path c:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\8.0.3\ref\net8.0 is invalid not existing path. The assembly Microsoft.ML.Tokenizers.dll has public type defined as public readonly struct Token. The tool will produce the following warnings:

CP1002: Could not resolve reference 'System.Runtime.dll' in any of the provided search directories.
CP1002: Could not resolve reference 'System.Text.RegularExpressions.dll' in any of the provided search directories.
CP1002: Could not resolve reference 'Google.Protobuf.dll' in any of the provided search directories.
CP1002: Could not resolve reference 'System.Collections.dll' in any of the provided search directories.
CP1002: Could not resolve reference 'System.Text.Json.dll' in any of the provided search directories.
CP1002: Could not resolve reference 'System.Collections.Concurrent.dll' in any of the provided search directories.
CP1002: Could not resolve reference 'System.Net.Http.dll' in any of the provided search directories.
CP1002: Could not resolve reference 'System.Memory.dll' in any of the provided search directories.
CP1002: Could not resolve reference 'System.Linq.dll' in any of the provided search directories.
CP1002: Could not resolve reference 'System.Threading.dll' in any of the provided search directories.
CP1002: Could not resolve reference 'System.IO.Compression.dll' in any of the provided search directories.

But it will generated the type as public sealed partial class Token which is wrong.

It's advisable to refrain from generating any incorrect interfaces until the user resolves the --assembly-reference path. This prevents users from overlooking warnings and inadvertently utilizing incorrectly generated interfaces.
When fixing the --assembly-reference path, the tool work fine and generate the correct interfaces.

Exceptions (if any)

No exception

Further technical details

Microsoft.DotNet.GenAPI v9.0.100-preview.5.24227.1+0f7644da23265f1be382b28ff56f5505b0329334