Fix Zypper Package Manager Return Code 8

[benank]

Fixes Zypper package manager return code 8. This error occurs when a package fails to install due to a conflict with another package.

[codecov]

Codecov Report

Merging #122 (6ae6190) into master (abbe3e8) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #122      +/-   ##
==========================================
+ Coverage   80.64%   80.75%   +0.11%     
==========================================
  Files          86       86              
  Lines       11631    11682      +51     
==========================================
+ Hits         9380     9434      +54     
+ Misses       2251     2248       -3     

Flag	Coverage Δ
python27	79.86% <100.00%> (+0.11%)	⬆️
python39	80.71% <100.00%> (+0.13%)	⬆️

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Impacted Files	Coverage Δ
.../core/src/package_managers/ZypperPackageManager.py	85.56% <100.00%> (+0.48%)	⬆️
src/core/tests/Test_ZypperPackageManager.py	96.35% <100.00%> (+0.30%)	⬆️
src/core/tests/library/LegacyEnvLayerExtensions.py	94.04% <100.00%> (+0.10%)	⬆️
src/extension/tests/Test_ExtOutputStatusHandler.py	95.93% <0.00%> (-2.44%)	⬇️
src/core/src/service_interfaces/TelemetryWriter.py	79.50% <0.00%> (+0.40%)	⬆️
src/extension/tests/Test_TelemetryWriter.py	92.30% <0.00%> (+0.85%)	⬆️
...core/src/service_interfaces/LifecycleManagerArc.py	66.94% <0.00%> (+3.30%)	⬆️

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