Invalid C# for anyOf with nullable UUID array

[verdie-g]

What are you generating using Kiota, clients or plugins?

API Client/SDK

In what context or format are you using Kiota?

Nuget tool

Client library/SDK language

Csharp

Describe the bug

When an OpenAPI schema has an anyOf with a UUID array and null:

validation_files:
  anyOf:
    - items:
        format: uuid
        type: string
      type: array
    - type: 'null'

Kiota generates:

if(parseNode.GetCollectionOfPrimitiveValues<Guid?>()?.AsList() is List<Guid> guidValue)
{
    result.Guid = guidValue;
}

This doesn't compile - List<Guid?> can't be pattern-matched to List.

Expected behavior

Code compiles.

How to reproduce

mkdir /tmp/kiota-bug && cd /tmp/kiota-bug
kiota generate -l CSharp -d openapi.yaml -o . -n Test -c TestClient
dotnet new classlib && dotnet add package Microsoft.Kiota.Bundle
dotnet build

Open API description file

openapi: 3.1.0
info:
  title: Test
  version: 1.0.0
paths:
  /test:
    get:
      operationId: test
      responses:
        '200':
          content:
            application/json:
              schema:
                properties:
                  files:
                    anyOf:
                      - items:
                          format: uuid
                          type: string
                        type: array
                      - type: 'null'
                type: object

Kiota Version

1.29.0+c21ebceb977bc33def3d8a9e5237b798a7b962b6

Latest Kiota version known to work for scenario above?(Not required)

No response

Known Workarounds

No response

Configuration

• OS: MacOS
• Architecture: ARM64

Debug output

Click to expand log

```

dbug: Kiota.Builder.KiotaBuilder[0]
kiota version 1.29.0
info: Kiota.Builder.KiotaBuilder[0]
loaded description from local source
dbug: Kiota.Builder.KiotaBuilder[0]
step 1 - reading the stream - took 00:00:00.0040359
warn: Kiota.Builder.KiotaBuilder[0]
OpenAPI warning: #/ - A servers entry (v3) or host + basePath + schemes properties (v2) was not present in the OpenAPI description. The root URL will need to be set manually with the request adapter.
fail: Kiota.Builder.KiotaBuilder[0]
OpenAPI error: #/paths/~1test/get/responses/200/description - The field 'description' in 'response' object is REQUIRED.
dbug: Kiota.Builder.KiotaBuilder[0]
step 2 - parsing the document - took 00:00:00.0441865
dbug: Kiota.Builder.KiotaBuilder[0]
step 3 - updating generation configuration from kiota extension - took 00:00:00.0000530
dbug: Kiota.Builder.KiotaBuilder[0]
step 4 - filtering API paths with patterns - took 00:00:00.0022637
warn: Kiota.Builder.KiotaBuilder[0]
No server url found in the OpenAPI document. The base url will need to be set when using the client.
dbug: Kiota.Builder.KiotaBuilder[0]
step 5 - checking whether the output should be updated - took 00:00:00.0089746
dbug: Kiota.Builder.KiotaBuilder[0]
step 6 - create uri space - took 00:00:00.0015642
dbug: Kiota.Builder.KiotaBuilder[0]
InitializeInheritanceIndex 00:00:00.0016758
dbug: Kiota.Builder.KiotaBuilder[0]
CreateRequestBuilderClass 00:00:00
dbug: Kiota.Builder.KiotaBuilder[0]
MapTypeDefinitions 00:00:00.0015748
dbug: Kiota.Builder.KiotaBuilder[0]
TrimInheritedModels 00:00:00
dbug: Kiota.Builder.KiotaBuilder[0]
CleanUpInternalState 00:00:00
dbug: Kiota.Builder.KiotaBuilder[0]
step 7 - create source model - took 00:00:00.0295618
dbug: Kiota.Builder.KiotaBuilder[0]
12ms: Language refinement applied
dbug: Kiota.Builder.KiotaBuilder[0]
step 8 - refine by language - took 00:00:00.0125041
dbug: Kiota.Builder.KiotaBuilder[0]
step 9 - writing files - took 00:00:00.0160745
info: Kiota.Builder.KiotaBuilder[0]
loaded description from local source
dbug: Kiota.Builder.KiotaBuilder[0]
step 10 - writing lock file - took 00:00:00.0096806
Generation completed successfully
dbug: Kiota.Builder.KiotaBuilder[0]
Api manifest path: /private/tmp/kiota-bug/apimanifest.json

</details>


### Other information

_No response_