Add missing workflow run conclusions

[ezhevita]

Resolves #2684

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Behavior

Before the change?

• The property to get a workflow run conclusion throws an exception when trying to get value of the workflow run with the conclusion of startup_failure or skipped.

After the change?

• The property returns the workflow run conclusion correctly and doesn't throw an exception.

Other information

• I've mentioned in the original issue that GitHub documentation doesn't include these values as well, so it will be great if you pass this information internally to the docs team 😄

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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
• No

Pull request type

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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[ezhevita]

also GitHub doesn't seem to allow me to add a label to the PR, so if someone adds it for me I'll be happy 😁
the appropriate label is Type: Bug

[nickfloyd]

Hey @ezhevita, Thanks for the work here ❤️ . We're still chatting about the API docs and the need for the enum values to be surfaced in a more visible way but this change is a solid addition to the SDK, thanks again for doing it!