Link Hackbot runs to their Weave conversations

[evgenyrp]

There are such lines in summary.json now, and there are links in the UI:

"conversations": [
    {
      "id": "6596ce7a-963a-4f10-bf94-b9acc906c209",
      "url": "https://wandb.ai/moz-bugbug/hackbot-test/weave/agents/conversations/6596ce7a-963a-4f10-bf94-b9acc906c209"
    },
    {
      "id": "6bb114e3-810d-46fe-bd75-9199ad835c22",
      "url": "https://wandb.ai/moz-bugbug/hackbot-test/weave/agents/conversations/6bb114e3-810d-46fe-bd75-9199ad835c22"
    }
  ]

fixes #6666