[OpenAPI] Update RunResultState

[mach-kernel]

Resolves #36, doing an E2E test now to make sure nothing breaks 🤞

[mach-kernel]

Note: The new version of openapi-generator seems to be double boxing Option:

    #[serde(rename = "git_source", default, with = "::serde_with::rust::double_option", skip_serializing_if = "Option::is_none")]
    pub git_source: Option<Option<Box<crate::models::GitSource>>>,

Turns out our use of JsonSchema would need this to use a different invocation of the derive macro: GREsau/schemars#89

But there's no need to double box them so I've edited these out. For future reference.

[mach-kernel]

E2E test passed, packing release up!