chore(slo): refactor orphan summary cleanup task

[kdelemme]

Summary

This PR refactors the SLO orphan summary cleanup task for better code organization and consistency with the other tasks, as well as fixing the abortController usage for allowing the task to be properly cancelled on timeout.

Testing

• Create some SLOs with group by
• Wait for the summary documents to be generated
• Insert a dummy summary documents with a fake inexistant slo.id and revision (POST .slo-observability.summary-v3.5/_doc
• Wait for the task to run (enable logging.logger for plugins.slo)
• Confirm dummy summary document is gone

## LOGGER
logging:
  loggers:
    - name: plugins.slo
      level: debug

[elasticmachine]

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[elasticmachine]

💔 Build Failed

• Buildkite Build
• Commit: 61992c4

Failed CI Steps

• FTR Configs #133
• FTR Configs #133

Test Failures

• [job] [logs] FTR Configs #133 / task_manager check_registered_task_types should check changes on all registered task types
• [job] [logs] FTR Configs #133 / task_manager check_registered_task_types should check changes on all registered task types

Metrics [docs]

✅ unchanged

History

cc @kdelemme