fix(python): add backward compatibility for SandboxClaim status.sandbox.Name

[kincoy]

Adds backward compatibility for status.sandbox.name in the Python client.

PR #440 renamed the field from Name to name but the change isn't released yet. Older controllers still return Name, breaking things for users (#505).

The code review bot in #440 actually recommended adding a fallback to check both fields, but it didn't make it into the final PR. This adds that fallback - it's just one line and lets the Python client work with any controller version.

Fixes #505

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