[Bug 2150439] Re: Refactor UpdateManager.py: improve logging, structure, and error handling

[Nathan Teodosio]

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Title:
  Refactor UpdateManager.py: improve logging, structure, and error
  handling

Status in update-manager package in Ubuntu:
  New

Bug description:
  This patch refactors UpdateManager.py to improve readability,
  maintainability, and robustness.

  Changes include:
  - Structured imports into logical sections
  - Added docstrings for better documentation
  - Replaced print statements with logging
  - Improved exception handling
  - Safer attribute access using getattr

  No functional changes are intended.

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