Exit service after a panic happens inside the onFileChange method

[dilanSachi]

Purpose

$subject
Related to ballerina-platform/ballerina-library#4241
Tested the scenarios locally since we cannot add tests to this as System.exit will exit the complete test suite in the runtime.

Examples

Checklist

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

[codecov]

Codecov Report

Patch coverage: 66.66% and project coverage change: -0.03 ⚠️

Comparison is base (f9ead80) 82.76% compared to head (fd51167) 82.73%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #894      +/-   ##
============================================
- Coverage     82.76%   82.73%   -0.03%     
  Complexity      326      326              
============================================
  Files            39       39              
  Lines          1654     1657       +3     
  Branches        272      273       +1     
============================================
+ Hits           1369     1371       +2     
- Misses          185      186       +1     
  Partials        100      100              

Impacted Files	Coverage Δ
...va/io/ballerina/stdlib/ftp/server/FtpListener.java	79.16% <66.66%> (-0.27%)	⬇️

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