Add Unit Tests for MCP feature

[rithin-pullela-aws]

Description

Adds Unit tests for MCP feature

Related Issues

Resolves #3743

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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[dhrubo-os]

are we planning to add any integration test too?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.86%. Comparing base (c3b1fd6) to head (9d0b9a7).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3787      +/-   ##
============================================
+ Coverage     77.98%   78.86%   +0.88%     
- Complexity     7316     7383      +67     
============================================
  Files           655      655              
  Lines         33037    33037              
  Branches       3708     3708              
============================================
+ Hits          25764    26055     +291     
+ Misses         5688     5354     -334     
- Partials       1585     1628      +43     

Flag	Coverage Δ
ml-commons	78.86% <ø> (+0.88%)	⬆️

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[rithin-pullela-aws]

are we planning to add any integration test too?

@dhrubo-os, not in this PR.

Building ITs for MCP use case is not straight forward, because we would want an MCP server running to test the capability. We can perhaps use the MCP Server in openSearch to write ITs and test, I will look into it.