chore(cli): improve error logging with detailed error messages for init

[rohang9000]

Changed init.ts error logging in initializeGitRepository(), postInstallJava(), and postInstallPython() methods to be more detailed.

Fixes #

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.41%. Comparing base (8e53a08) to head (477019d).

Files with missing lines	Patch %	Lines
packages/aws-cdk/lib/commands/init/init.ts	16.66%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #778      +/-   ##
==========================================
+ Coverage   80.81%   81.41%   +0.59%     
==========================================
  Files          63       63              
  Lines        8554     8554              
  Branches     1025     1028       +3     
==========================================
+ Hits         6913     6964      +51     
+ Misses       1612     1561      -51     
  Partials       29       29              

Flag	Coverage Δ
suite.unit	81.41% <16.66%> (+0.59%)	⬆️

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[iankhou]

Could you provide some examples of what the error looks like for these cases?