Support Workflows associated to deployment environments

[lineville]

Resolves #258, #259

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Behavior

Before the change?

• No model to support the WorkflowJobWaiting event.
• No deployment property included in WorkflowJob payloads.

After the change?

• Adds support for the WorkflowJobWaitingEvent which will get triggered when a job enters a waiting state which can occur if a job is associated to an environment that requires a manual approval.
• Includes a deployment node to the WorkflowJobPayload which will be present when a workflow is associated to an environment.

Other information

• Two additional unit tests have been added to cover these changes, all existing tests still pass 🧪

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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:

• N/A

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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[JamieMagee]

I'll merge this shortly and release version 1.5.1.

[lineville]

@JamieMagee Awesome! Thanks so much for the quick turn around ♥️