Fix compiler plugin validation issues

[SachinAkash01]

Purpose

$subject

Examples

Checklist

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

[codecov]

Codecov Report

❌ Patch coverage is 17.00680% with 122 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.22%. Comparing base (fb1727b) to head (60699b5).
⚠️ Report is 11 commits behind head on master.

Files with missing lines	Patch %	Lines
...ballerina/stdlib/ftp/util/FtpContentConverter.java	0.00%	45 Missing ⚠️
...va/io/ballerina/stdlib/ftp/plugin/PluginUtils.java	29.31%	35 Missing and 6 partials ⚠️
...stdlib/ftp/plugin/FtpContentFunctionValidator.java	0.00%	26 Missing ⚠️
...ina/stdlib/ftp/plugin/FtpFileDeletedValidator.java	0.00%	5 Missing ⚠️
...a/stdlib/ftp/server/FtpContentCallbackHandler.java	0.00%	5 Missing ⚠️

❌ Your project status has failed because the head coverage (65.22%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1505      +/-   ##
============================================
- Coverage     66.75%   65.22%   -1.53%     
- Complexity      292      392     +100     
============================================
  Files            34       45      +11     
  Lines          1910     2407     +497     
  Branches        259      369     +110     
============================================
+ Hits           1275     1570     +295     
- Misses          545      692     +147     
- Partials         90      145      +55     

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
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