[2201.4.x] Fix logic issue in ServiceExecutionError not getting properly populated with error details when there is a panic from within the websubhub:Service

[ayeshLK]

Purpose

$subject

Fixes: #4217

Examples

N/A

Checklist

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

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.22 ⚠️

Comparison is base (34a3a74) 88.95% compared to head (0235ca5) 88.74%.

Additional details and impacted files

@@              Coverage Diff               @@
##             2201.4.x     #808      +/-   ##
==============================================
- Coverage       88.95%   88.74%   -0.22%     
  Complexity         37       37              
==============================================
  Files              15       15              
  Lines             842      844       +2     
  Branches          448      448              
==============================================
  Hits              749      749              
- Misses             89       91       +2     
  Partials            4        4              

Impacted Files	Coverage Δ
...ava/io/ballerina/stdlib/websubhub/HubCallback.java	63.63% <0.00%> (-6.37%)	⬇️

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