[Java21_Perf] Remove additional virtual thread creation

[TharmiganK]

Purpose

$Subject

Examples

Checklist

• Linked to an issue
• Updated the changelog
• Added tests
• Updated the spec
• Checked native-image compatibility
• Checked the impact on OpenAPI generation

[codecov]

Codecov Report

Attention: Patch coverage is 80.70175% with 11 lines in your changes missing coverage. Please review.

Project coverage is 79.84%. Comparing base (ab29540) to head (bd1e7c8).

Files with missing lines	Patch %	Lines
...a/stdlib/http/api/HttpInterceptorUnitCallback.java	69.56%	7 Missing ⚠️
...rina/stdlib/http/api/HttpCallableUnitCallback.java	91.30%	2 Missing ⚠️
...tdlib/http/api/BallerinaHTTPConnectorListener.java	66.66%	1 Missing ⚠️
.../http/api/HttpResponseInterceptorUnitCallback.java	75.00%	1 Missing ⚠️

Additional details and impacted files

@@                Coverage Diff                @@
##             java21_perf    #2271      +/-   ##
=================================================
- Coverage          79.87%   79.84%   -0.03%     
  Complexity           678      678              
=================================================
  Files                417      418       +1     
  Lines              23116    23072      -44     
  Branches            3748     3748              
=================================================
- Hits               18463    18422      -41     
+ Misses              3524     3522       -2     
+ Partials            1129     1128       -1     

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud