Allow Lightning-style edge conditions to be executed in the CLI

[josephjclark]

Closes #1123

Steps to glory:

• Parse and serialise conditions in v1 state
• Parse and serialise conditions in v2 state (nothing needed here)
• Allow the runtime to handle special conditions like on_job_success
• Ensure the runtime passes the upstream step id into edge condition functions
• Remove the condition mapping logic from the worker's convert-lightning-state
• Ensure we have reasonable test coverage of this stuff

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