feat: added retry logic for NR layers API fetch

[Sashwatdas123]

Description

Added fetchWithRetry function to handle network failures when fetching New Relic layer ARNs with automatic retry after 1 second delay.

Related Issues

#540

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 39.86%. Comparing base (e748c90) to head (93c7396).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #541      +/-   ##
==========================================
+ Coverage   39.24%   39.86%   +0.61%     
==========================================
  Files           4        4              
  Lines         586      592       +6     
  Branches      164      164              
==========================================
+ Hits          230      236       +6     
  Misses        318      318              
  Partials       38       38              

Flag	Coverage Δ
unit-tests	39.86% <100.00%> (+0.61%)	⬆️

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