Renamed 'clem' backend server module to 'workflow_clem'

[tieneupin]

This is to bring it in line with the naming pattern of other workflow-related endpoint modules as the project and our supported workflows continue to expand.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.13%. Comparing base (546dbac) to head (94c0241).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #794   +/-   ##
=======================================
  Coverage   52.13%   52.13%           
=======================================
  Files          96       96           
  Lines       10238    10238           
  Branches     1340     1340           
=======================================
  Hits         5338     5338           
  Misses       4627     4627           
  Partials      273      273           

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