Sample generation fails

[pshao25]

Repro steps:

1. Checkout to [DNM] Compute tsp swagger SDK generation verification azure-rest-api-specs#32432
2. In the SDK repo, change the path in sdk\compute\Azure.ResourceManager.Compute\src\autorest.md to the local azure-rest-api-specs\specification\compute\resource-manager\readme.md.
3. Run generation.

Error:

fatal   | System.ArgumentException: An item with the same key has already been added. Key: AutomaticallyApprove
     at System.Collections.Generic.Dictionary`2.TryInsert(TKey key, TValue value, InsertionBehavior behavior)
     at System.Collections.Generic.Dictionary`2.Add(TKey key, TValue value)
     at AutoRest.CSharp.Common.Output.Models.Samples.ExampleValueSnippets.GetExpressionForObjectType(ObjectType objectType, IReadOnlyDictionary`2 valueDict) in D:\a\_work\1\s\autorest.csharp\src\AutoRest.C 
  Sharp\Common\Output\Expressions\Samples\Snippets.ExampleValues.cs:line 418
     at AutoRest.CSharp.Common.Output.Models.Samples.ExampleValueSnippets.GetExpressionForTypeProvider(CSharpType type, InputExampleValue exampleValue) in D:\a\_work\1\s\autorest.csharp\src\AutoRest.CSharp 
  \Common\Output\Expressions\Samples\Snippets.ExampleValues.cs:line 346
     at AutoRest.CSharp.Common.Output.Models.Samples.ExampleValueSnippets.GetExpression(CSharpType type, InputExampleValue exampleValue, SerializationFormat serializationFormat, Boolean includeCollectionIn 
  itialization) in D:\a\_work\1\s\autorest.csharp\src\AutoRest.CSharp\Common\Output\Expressions\Samples\Snippets.ExampleValues.cs:line 38
     at AutoRest.CSharp.Common.Output.Models.Samples.ExampleValueSnippets.GetExpressionForObjectType(ObjectType objectType, IReadOnlyDictionary`2 valueDict) in D:\a\_work\1\s\autorest.csharp\src\AutoRest.C 
  Sharp\Common\Output\Expressions\Samples\Snippets.ExampleValues.cs:line 417
     at AutoRest.CSharp.Common.Output.Models.Samples.ExampleValueSnippets.GetExpressionForTypeProvider(CSharpType type, InputExampleValue exampleValue) in D:\a\_work\1\s\autorest.csharp\src\AutoRest.CSharp 
  \Common\Output\Expressions\Samples\Snippets.ExampleValues.cs:line 346
     at AutoRest.CSharp.Common.Output.Models.Samples.ExampleValueSnippets.GetExpression(CSharpType type, InputExampleValue exampleValue, SerializationFormat serializationFormat, Boolean includeCollectionIn 
  itialization) in D:\a\_work\1\s\autorest.csharp\src\AutoRest.CSharp\Common\Output\Expressions\Samples\Snippets.ExampleValues.cs:line 38
     at AutoRest.CSharp.Common.Output.Models.Samples.ExampleValueSnippets.GetExpression(ExampleParameterValue exampleParameterValue, SerializationFormat serializationFormat) in D:\a\_work\1\s\autorest.csha 
  rp\src\AutoRest.CSharp\Common\Output\Expressions\Samples\Snippets.ExampleValues.cs:line 221