Update client initialization to improve BI compatibility

[Nuvindu]

Purpose

$subject

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 61.98%. Comparing base (c307778) to head (529725c).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
ballerina/vector_store.bal	75.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #11   +/-   ##
=======================================
  Coverage   61.98%   61.98%           
=======================================
  Files           2        2           
  Lines         171      171           
  Branches       63       63           
=======================================
  Hits          106      106           
  Misses         65       65           

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