Add support for recurseSubmodules on Git sources in Azure GitOps (Flux v2) / az k8s-configuration (patch GitRepository)˜

I can’t find any supported way in Azure GitOps (Flux v2) to enable Git submodules for a Flux GitRepository source (i.e., set spec.recurseSubmodules: true). Flux upstream supports this field and it’s very useful when the cluster config repo references Helm charts or manifests via submodules. Is possible to expose and support recurseSubmodules in Azure GitOps (Flux v2) so we can configure it via Azure APIs/CLI/Portal.

### Related command

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### Errors

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### Issue script & Debug output

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### Expected behavior

`az k8s-configuration flux create \ --recurseSubmodules true`

### Environment Summary

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### Additional context

_No response_

Start at the `az k8s-configuration flux create` entry point and trace how Azure GitOps Flux v2 GitRepository settings are passed through the CLI and Azure API. Compare the supported fields with Flux’s `spec.recurseSubmodules`; done means the expected `--recurseSubmodules true` configuration is accepted and preserved when creating or patching a Git source.

Written by the indexing model from the issue text.