♻️ Shutdown refactoring & better logging

[aleksul]

Change Summary

• Use timeouts for gracefully finishing
• More logs for shut down edge-cases
• Timeouts for finishing consumers and stopping health check server
• Set logging to debug level on actor's Processor

Checklist

• [x] Unit tests for the changes exist
• [x] Tests pass on CI and coverage remains at 100%
• [x] Documentation reflects the changes where applicable
• [x] My PR is ready to review

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