[2201.11.0-stage] Set encoded function name in lambda details

[gimantha]

Purpose

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Fixes #43675

Approach

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Samples

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Remarks

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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 77.39%. Comparing base (ff7837e) to head (c23e419).
Report is 88 commits behind head on 2201.11.0-stage.

Additional details and impacted files

@@                Coverage Diff                 @@
##             2201.11.0-stage   #43678   +/-   ##
==================================================
  Coverage              77.39%   77.39%           
- Complexity             58583    58588    +5     
==================================================
  Files                   3445     3445           
  Lines                 219112   219113    +1     
  Branches               28967    28967           
==================================================
+ Hits                  169576   169589   +13     
+ Misses                 40113    40101   -12     
  Partials                9423     9423           

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