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

[Nathan Teodosio]

There are many instances of style modifications, e.g.

-->
             self.initial_focus_id = self.connect(
-                "focus-in-event", self.on_initial_focus_in
+                "focus-in-event",
+                self.on_initial_focus_in
             )
<--

These only make the already big patch bigger, unnecessarily adding to
the reviewer's load.

In any case, I do not think we should be refactoring this code base,
which is arguably legacy. If there is a concrete and observable bug, a
targeted change is very welcome, otherwise I would advise against
changes.

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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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