Removes unused pipeline files

[gingi]

Removes pipeline scripts and templates used in the distribution pipeline, while simplifying the continuous integration (CI) pipeline. All the distribution pipeline code has already been migrated to a private repository on Azure DevOps.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.27%. Comparing base (fc5ee10) to head (e2fde13).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2999   +/-   ##
=======================================
  Coverage   80.27%   80.27%           
=======================================
  Files        1466     1466           
  Lines       46366    46366           
  Branches     5797     5797           
=======================================
  Hits        37222    37222           
  Misses       8955     8955           
  Partials      189      189           

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