fix: clean up @workspace dead code after removing from context menu

[chungjac]

Previous PR which removed the @workspace functionality: #2669

Problem

After removing @workspace from the context commands menu, there is dead code remaining.

Solution

Clean up dead code

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.46%. Comparing base (bf7c32f) to head (3ac5b00).
⚠️ Report is 2 commits behind head on feature/removing-at-workspace.

Additional details and impacted files

@@                        Coverage Diff                        @@
##           feature/removing-at-workspace    #2670      +/-   ##
=================================================================
- Coverage                          60.51%   60.46%   -0.06%     
=================================================================
  Files                                279      279              
  Lines                              66299    66189     -110     
  Branches                            4257     4243      -14     
=================================================================
- Hits                               40121    40021     -100     
+ Misses                             26093    26084       -9     
+ Partials                              85       84       -1     

Flag	Coverage Δ
unittests	60.46% <100.00%> (-0.06%)	⬇️

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