Output all environment variables in case that agent telemetry features is not found

[benank]

Ouputs all environment variables using os.environ() if the environment variable for guest agent supported features is not found.

[codecov]

Codecov Report

Merging #123 (b8a16a4) into master (7259905) will increase coverage by 0.27%.
The diff coverage is 0.00%.

❗ Current head b8a16a4 differs from pull request most recent head 653ae92. Consider uploading reports for the commit 653ae92 to get more accurate results

@@            Coverage Diff             @@
##           master     #123      +/-   ##
==========================================
+ Coverage   80.30%   80.57%   +0.27%     
==========================================
  Files          86       86              
  Lines       11610    11611       +1     
==========================================
+ Hits         9323     9356      +33     
+ Misses       2287     2255      -32     

Impacted Files	Coverage Δ
src/core/src/service_interfaces/TelemetryWriter.py	76.63% <0.00%> (-0.32%)	⬇️
src/extension/tests/Test_ExtOutputStatusHandler.py	98.37% <0.00%> (+2.43%)	⬆️
src/extension/src/TelemetryWriter.py	69.87% <0.00%> (+6.41%)	⬆️
src/extension/tests/Test_TelemetryWriter.py	91.45% <0.00%> (+17.09%)	⬆️

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