feat: error message string now shows Exception name

[jjmachan]

Description

Improve the help message by showing the Exception class name along with the exception message
closes:

[codecov]

Codecov Report

Merging #157 (e51e7f6) into main (adf99fe) will increase coverage by 0.10%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##             main     #157      +/-   ##
==========================================
+ Coverage   65.37%   65.47%   +0.10%     
==========================================
  Files          19       19              
  Lines        1031     1034       +3     
==========================================
+ Hits          674      677       +3     
  Misses        357      357              

Flag	Coverage Δ
unit-tests	65.47% <80.00%> (+0.10%)	⬆️

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Impacted Files	Coverage Δ
bentoctl/exceptions.py	81.53% <75.00%> (+0.89%)	⬆️
bentoctl/deployment_config.py	66.66% <100.00%> (ø)

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