Fix completion test failures within annotations

[nadeeshaan]

Purpose

With this fix the completion test failures due to the language feature implementation for #20706

Fixes #20756

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

[NipunaRanasinghe]

Reviewed

[rasika]

Reviewed

[codecov-io]

Codecov Report

Merging #20950 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #20950   +/-   ##
=======================================
  Coverage   14.59%   14.59%           
=======================================
  Files          51       51           
  Lines        1398     1398           
  Branches      214      214           
=======================================
  Hits          204      204           
  Misses       1178     1178           
  Partials       16       16

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