Improve test coverage for all the packages

[addityasingh]

Improve test coverage for all the packages

Coverage Improvements Summary

Package	Original Coverage	Improved Coverage	Improvement
pkg/admin	93.3%	93.3%	No change needed
pkg/monitoring	70.5%	78.6%	+8.1%
pkg/replication	85.9%	90.6%	+4.7%
pkg/storage	81.5%	86.0%	+4.5%
pkg/watcher	93.3%	91.4%	Stable

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.50%. Comparing base (827fdaa) to head (b94a528).
Report is 5 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main       #8       +/-   ##
===========================================
+ Coverage   22.09%   68.50%   +46.41%     
===========================================
  Files           8        9        +1     
  Lines         842      978      +136     
===========================================
+ Hits          186      670      +484     
+ Misses        653      286      -367     
- Partials        3       22       +19     

Flag	Coverage Δ
combined	68.50% <100.00%> (+46.41%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
pkg/admin/server.go	89.28% <100.00%> (+79.46%)	⬆️
pkg/monitoring/metrics.go	74.34% <100.00%> (+39.47%)	⬆️

... and 5 files with indirect coverage changes

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