enhance: fetch containers eagerly when sync containers

[fregataa]

Checklist: (if applicable)

• Milestone metadata specifying the target backport version
• Mention to the original issue
• Installer updates including:
  • Fixtures for db schema changes
  • New mandatory config options
• Update of end-to-end CLI integration tests in ai.backend.test
• API server-client counterparts (e.g., manager API -> client SDK)
• Test case(s) to:
  • Demonstrate the difference of before/after
  • Demonstrate the flow of abstract/conceptual models with a concrete implementation
• Documentation
  • Contents in the docs directory
  • docstrings in public interfaces and type annotations

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[fregataa]

• enhance: fetch containers eagerly when sync containers #2262 👈
• fix: Keep sync_container_lifecycles() bgtask alive in a loop. #2178 : 3 other dependent PRs (#2179 , #2317 , #2338 )
• main

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