Rename `params` in Slack button value to `inputs`

[suhaibmujahid]

In the API part, we call it inputs, so it is better to use that here for consistency.

bugbug/services/hackbot-api/app/slack/listeners/actions/start_agent_run.py

Line 22 in c616a0c

params: dict[str, Any] = {}

bugbug/agents/frontend-triage/hackbot_agents/frontend_triage/notify.py

Line 151 in c616a0c

params={"bug_id": result.bug_id},