feat: add metrics for updaterun

[jwtty]

Description of your changes

1. When updateRun is stuck waiting for a cluster update to finish or waiting for after-stage tasks to complete, we mark updateRun Progressing condition to false and add corresponding reacon.
2. Add updateRun status metrics based on updateRun condition. The metric contains 5 labels: name, generation, condition, status and reason. The value is the timestamp when the status metric is emitted.

Generated metrics look like:

# TYPE fleet_workload_update_run_status_last_timestamp_seconds gauge
fleet_workload_update_run_status_last_timestamp_seconds{condition="Succeeded",generation="1",name="example-run",reason="UpdateRunSucceeded",status="True"} 1.7452803474895709e+09

Fixes #

I have:

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How has this code been tested

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