Improve code coverage in type conversion

[HindujaB]

Purpose

$subject

Fixes #42449

Approach

Samples

Provide high-level details about the samples related to this feature.

Remarks

List any other known issues, related PRs, TODO items, or any other notes related to the PR.

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 77.21%. Comparing base (322d2cf) to head (1a3c29c).
Report is 93 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #42733      +/-   ##
============================================
+ Coverage     77.19%   77.21%   +0.02%     
- Complexity    51288    51306      +18     
============================================
  Files          2929     2929              
  Lines        204429   204429              
  Branches      26669    26669              
============================================
+ Hits         157812   157853      +41     
+ Misses        38054    38015      -39     
+ Partials       8563     8561       -2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.