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

[Arnab Patra]

Public bug reported:

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.

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: update-manager

** Patch added: "clean-updatemanager.patch"
   https://bugs.launchpad.net/bugs/2150439/+attachment/5966085/+files/clean-updatemanager.patch

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https://bugs.launchpad.net/bugs/2150439

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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