[2201.7.x] Fix legacy mocking failure

[Thevakumar-Luheerathan]

Purpose

Describe the problems, issues, or needs driving this feature/fix and include links to related issues.

Fixes #40731
2201.7.x PR of #41686

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

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (05141ec) 76.37% compared to head (ccd514c) 76.36%.
Report is 1 commits behind head on 2201.7.x.

Files	Patch %	Lines
...o2/ballerinalang/compiler/desugar/MockDesugar.java	80.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@              Coverage Diff               @@
##             2201.7.x   #41688      +/-   ##
==============================================
- Coverage       76.37%   76.36%   -0.01%     
- Complexity      55274    55275       +1     
==============================================
  Files            3387     3387              
  Lines          208632   208642      +10     
  Branches        26976    26981       +5     
==============================================
- Hits           159340   159330      -10     
- Misses          40580    40600      +20     
  Partials         8712     8712              

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