Bugfix: Restore patch mode config on Image Default

[rane-rajasi]

We have a force disable logic for machine default auto updates in Auto Patching. i.e. we disable all machine default auto updates if the VM is onboarded to Auto Patching.

This PR ensures that we reset to machine default auto updates when patch mode is reset to ImageDefault

Changes included
[x] Resetting to machine default for Aptitude Package Manager
[x] Resetting to machine default for Tdnf Package Manager
[x] Resetting to machine default for Yum Package Manager
[x] Resetting to machine default for Zypper Package Manager

In VM Tests
[x] Aptitude Package Manager: Tested on: Ubuntu 20.04
     - 1.core.log

[x] Tdnf Package Manager: Tested on Az Linux 2
     - 7.core.log

[x] Yum Package Manager: Tested on: RHEL 8.2
     - 4.core.log & 3.core.log

[x] Zypper Package Manager: Tested on: SUSE 12
     - 3.core.log

Pending
[x] log and preserve masked state and not disable machine default auto updates if the underlying config is masked (will be addressed in a separate PR)

[Copilot]

Pull Request Overview

This PR restores the configuration of machine default auto updates when patch mode is reset to ImageDefault, ensuring that the appropriate backup settings are reapplied for supported package managers. Key changes include:

• Restoring machine default auto updates for both Yum and Aptitude package managers.
• Adding new tests to verify the revert functionality under various service configurations.
• Introducing a stub for the Zypper package manager’s revert functionality.

Reviewed Changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/core/tests/library/LegacyEnvLayerExtensions.py	Adds conditional handling for reverting to ImageDefault for Yum.
src/core/tests/Test_YumPackageManager.py	Introduces tests for reverting auto OS update settings for Yum services.
src/core/tests/Test_ConfigurePatchingProcessor.py	Adds test setup to validate ImageDefault patch mode configuration.
src/core/tests/Test_AptitudePackageManager.py	Adds tests for reverting auto OS update configuration under Aptitude.
src/core/src/package_managers/ZypperPackageManager.py	Adds an unimplemented stub for reverting auto OS update configuration.
src/core/src/package_managers/YumPackageManager.py	Implements revert functionality for Yum, DNF, and PackageKit services.
src/core/src/package_managers/PackageManager.py	Introduces an abstract stub for revert functionality.
src/core/src/package_managers/AptitudePackageManager.py	Implements revert functionality for Aptitude package manager.
src/core/src/core_logic/ConfigurePatchingProcessor.py	Updates patch mode handling to include the ImageDefault branch.

[codecov]

Codecov Report

Attention: Patch coverage is 96.21053% with 18 lines in your changes missing coverage. Please review.

Project coverage is 93.73%. Comparing base (d18a9ce) to head (badaa03).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...rc/core/src/package_managers/TdnfPackageManager.py	88.00%	6 Missing ⚠️
src/core/src/package_managers/YumPackageManager.py	89.65%	6 Missing ⚠️
...ore/src/package_managers/AptitudePackageManager.py	93.18%	3 Missing ⚠️
.../core/src/package_managers/ZypperPackageManager.py	93.75%	2 Missing ⚠️
src/core/src/package_managers/PackageManager.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #301      +/-   ##
==========================================
+ Coverage   93.53%   93.73%   +0.19%     
==========================================
  Files         103      103              
  Lines       17458    17881     +423     
==========================================
+ Hits        16330    16760     +430     
+ Misses       1128     1121       -7     

Flag	Coverage Δ
python27	93.72% <96.21%> (+0.19%)	⬆️
python312	93.73% <96.21%> (+0.19%)	⬆️

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[kjohn-msft]

Ping on status of this PR.

[kjohn-msft]

Comments inline

[kjohn-msft]

Minor comment on unexercised code.