CI: skip if triggering workflow failed

[ugtthis]

Problem:

• When Build workflow fails, Preview workflow still triggers
• needs.preview.outputs.check_id is undefined (because preview job couldn't run)
• Results in JavaScript syntax error from: check_run_id: ,
• Ran into this problem wth PR RouteInfo: add route action buttons #164 when it didn't pass the test the first time, after I committed the updated white house address, I got the below error from Preview workflow
  

Solution:

• Add github.event.workflow_run.conclusion == 'success' to skip when triggering workflow failed
• Put success check first for efficient short-circuit
• Code also found in commai/website repo

[github-actions]

deployed preview: https://192.connect-d5y.pages.dev

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