Remove deprecated BLangChannelLiteral sub class

[rdulmina]

Purpose

Remove the deprecated BLangChannelLiteral sub class as it is not used now

Fixes #43452

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 77.50%. Comparing base (4f61e6a) to head (ed1d289).
Report is 49 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #43453   +/-   ##
=========================================
  Coverage     77.49%   77.50%           
+ Complexity    58596    58595    -1     
=========================================
  Files          3438     3438           
  Lines        219263   219233   -30     
  Branches      28925    28925           
=========================================
- Hits         169927   169923    -4     
+ Misses        39916    39889   -27     
- Partials       9420     9421    +1     

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