[Infrastructure UI][Rules] Add recovery context to the Metric Threshold rule

[simianhacker]

Summary

This PR fixes #127078 by adding the available context to the Metric Threshold rule.

Sample Context for Recovery Alerts

{
    "group": "host-4",
    "metric": {
        "condition0": "system.cpu.user.pct"
    },
    "threshold": {
        "condition0": [
            1
        ]
    },
    "timestamp": "2022-04-29T18:25:12.590Z",
    "viewInAppUrl": "/app/metrics/explorer"
}

[elasticmachine]

Pinging @elastic/infra-monitoring-ui (Team:Infra Monitoring UI)

[simianhacker]

@elasticmachine merge upstream

[simianhacker]

@elasticmachine merge upstream

[kibana-ci]

💛 Build succeeded, but was flaky

• Buildkite Build
• Commit: b6b983e
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• Webpack Bundle Analyzer

Failed CI Steps

• FTR Configs #35

Test Failures

• [job] [logs] FTR Configs #35 / endpoint Endpoint permissions: "after all" hook in "Endpoint permissions:"
• [job] [logs] FTR Configs #35 / endpoint Endpoint permissions: "before all" hook in "Endpoint permissions:"

Metrics [docs]

✅ unchanged

History

• 💚 Build #45943 succeeded d663965
• 💛 Build #44990 was flaky 7f6d136
• 💚 Build #41793 succeeded 846b61c
• 💚 Build #41561 succeeded 6eadefc

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

[Kerry350]

LGTM 🙌