Remove unused rename popup command

[mindula]

Purpose

This PR removed the unused rename popup command that used the text position.

Fixes #40632

VSCode plugin PR: https://github.com/wso2-enterprise/ballerina-plugin-vscode/pull/1600

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 no project coverage change.

Comparison is base (367ee17) 76.44% compared to head (11b1e37) 76.44%.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #40790   +/-   ##
=========================================
  Coverage     76.44%   76.44%           
+ Complexity    55213    55210    -3     
=========================================
  Files          3377     3377           
  Lines        208026   208002   -24     
  Branches      26931    26926    -5     
=========================================
- Hits         159017   159012    -5     
+ Misses        40257    40235   -22     
- Partials       8752     8755    +3     

Impacted Files	Coverage Δ
...erinalang/langserver/LSClientCapabilitiesImpl.java	62.50% <ø> (-2.28%)	⬇️
.../langserver/common/constants/CommandConstants.java	90.00% <ø> (ø)
...lang/compiler/semantics/analyzer/CodeAnalyzer.java	87.65% <100.00%> (+0.05%)	⬆️
.../compiler/semantics/analyzer/QueryTypeChecker.java	89.12% <100.00%> (+0.05%)	⬆️
.../providers/createvar/CreateVariableCodeAction.java	90.12% <100.00%> (-2.88%)	⬇️
...oviders/createvar/ErrorHandleInsideCodeAction.java	86.36% <100.00%> (-4.95%)	⬇️
...viders/createvar/ErrorHandleOutsideCodeAction.java	95.83% <100.00%> (-2.13%)	⬇️

... and 9 files with indirect coverage changes

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[malinthar]

LGTM!