feat(cli): add `prefect flow-run retry` command
Add a new CLI command to retry failed or completed flow runs. The command
supports both UUID and name-based flow run identification, with automatic
disambiguation when multiple flow runs share the same name.
For deployment-based flow runs, the command schedules a retry that workers
will pick up. For local flow runs without a deployment, users can provide
an --entrypoint to execute the retry locally.
Also adds a `retry()` method to InfrastructureBoundFlow and updates worker
submit to accept an existing flow_run for retry scenarios.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>