Remove unnecessary checkCast calls

[warunalakshitha]

Purpose

Fixes #43881

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 75.06%. Comparing base (f3b07a4) to head (395adf9).
Report is 23 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #43942      +/-   ##
============================================
+ Coverage     75.05%   75.06%   +0.01%     
- Complexity    57512    57524      +12     
============================================
  Files          3540     3540              
  Lines        222373   222404      +31     
  Branches      28835    28840       +5     
============================================
+ Hits         166908   166957      +49     
+ Misses        46201    46175      -26     
- Partials       9264     9272       +8     

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