chore(agoric-cli): Document external consumption of gettingStartedWorkflowTest

[gibson042]

Description

Without this, packages/agoric-cli/integration-tests/workflow.test.js is an essentially empty wrapper.

Security Considerations

n/a

Scaling Considerations

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Documentation Considerations

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Testing Considerations

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Upgrade Considerations

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[gibson042]

Fair enough; done.

[gibson042]

This seems like the kind of thing that could blow up, so I've replaced the breaking change with some documentation. Thanks @turadg @michaelfig!