Fix 'Symbol service gives incomplete types for union type symbols'

[madushajg]

Purpose

Fixes #40207

Approach

Describe how you are implementing the solutions along with the design details.

Samples

Provide high-level details about the samples related to this feature.

Remarks

List any other known issues, related PRs, TODO items, or any other notes related to the PR.

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

Patch coverage: 100.00% and project coverage change: -0.38 ⚠️

Comparison is base (eb7fa13) 77.53% compared to head (98cb7bf) 77.16%.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #40209      +/-   ##
============================================
- Coverage     77.53%   77.16%   -0.38%     
+ Complexity    67118    54212   -12906     
============================================
  Files          3497     3340     -157     
  Lines        250324   201581   -48743     
  Branches      38208    25898   -12310     
============================================
- Hits         194085   155542   -38543     
+ Misses        47380    37588    -9792     
+ Partials       8859     8451     -408     

Impacted Files	Coverage Δ
...sions/ballerina/symbol/BallerinaSymbolService.java	66.16% <100.00%> (ø)

... and 877 files with indirect coverage changes

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