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 (eb4cdf8).
Report is 23 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #43991   +/-   ##
=========================================
  Coverage     75.05%   75.06%           
- Complexity    57512    57521    +9     
=========================================
  Files          3540     3540           
  Lines        222373   222402   +29     
  Branches      28835    28839    +4     
=========================================
+ Hits         166908   166947   +39     
+ Misses        46201    46183   -18     
- Partials       9264     9272    +8     

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[warunalakshitha]

We will add this changes with init time improvement PR. hence closing.