[master] Fix runtime invokeAsync API to call function block the calling Thread

[warunalakshitha]

Purpose

Fixes #42865
Fixes #42868

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

Attention: Patch coverage is 91.44737% with 13 lines in your changes missing coverage. Please review.

Project coverage is 77.38%. Comparing base (5ec8be9) to head (0989fe3).
Report is 30 commits behind head on master.

Files	Patch %	Lines
...java/io/ballerina/runtime/internal/BalRuntime.java	84.12%	9 Missing and 1 partial ⚠️
...rina/runtime/internal/scheduling/SyncCallback.java	62.50%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #43031      +/-   ##
============================================
+ Coverage     77.35%   77.38%   +0.02%     
- Complexity    58251    58329      +78     
============================================
  Files          3450     3451       +1     
  Lines        218927   219277     +350     
  Branches      28728    28873     +145     
============================================
+ Hits         169359   169692     +333     
- Misses        40243    40267      +24     
+ Partials       9325     9318       -7     

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[HindujaB]

LGTM