Fix runner application deserialization

[MatisseHack]

Resolves #2703

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Behavior

Before the change?

• Octokit throws a deserialization error when calling ListAllRunnerApplicationsForOrganization in the ActionsSelfHostedRunnersClient

After the change?

• No error is thrown

Other information

I fixed the issue by removing the extra IReadOnlyList layer since ApiConnection.GetAll already returns an IReadOnlyList. I also made a few other updates to theRunnerApplication model:

• Added a missing property in the model
• Fixed a property that was always null because it had the wrong casing (didn't match the JSON payload).
• Created a new RunnerLabel model since the Label model is for issue/PR labels and didn't match the properties in the JSON payload

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Additional info

Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Added the appropriate label for the given change

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes (Please add the Type: Breaking change label)
• No

If Yes, what's the impact:

• The casing for one property has been changed, which should be very low impact since the model was only added a few days ago.
• The model for one property has been changed, which should also be very low impact since most properties on the old model would be null anyway.

Pull request type

Bugfix

Please add the corresponding label for change this PR introduces:

• Bugfix: Type: Bug
• Feature/model/API additions: Type: Feature
• Updates to docs or samples: Type: Documentation
• Dependencies/code cleanup: Type: Maintenance

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[nickfloyd]

Hey @MatisseHack, this change looks good. Thank you for doing it ❤️. I will mark and ship this as a breaking change in light of the type change. Even though it's low risk, bumping major does not cost anything and is a signal in case consumers need to know.