Add proper waiting logic for created strands

[Thevakumar-Luheerathan]

Purpose

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Fixes #43711

Approach

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Samples

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Remarks

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Check List

• Read the Contributing Guide
• Updated Change Log
• Checked Tooling Support (#)
• Added necessary tests
  • Unit Tests
  • Spec Conformance Tests
  • Integration Tests
  • Ballerina By Example Tests
• Increased Test Coverage
• Added necessary documentation
  • API documentation
  • Module documentation in Module.md files
  • Ballerina By Examples

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.02%. Comparing base (d36a6f8) to head (878ce63).
Report is 137 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##             master   #43726    +/-   ##
==========================================
  Coverage     75.01%   75.02%            
- Complexity    57736    57882   +146     
==========================================
  Files          3547     3566    +19     
  Lines        223270   223808   +538     
  Branches      28895    28944    +49     
==========================================
+ Hits         167478   167901   +423     
- Misses        46502    46597    +95     
- Partials       9290     9310    +20     

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