CHORE: update CHANGELOG for v0.17.4

[pyansys-ci-bot]

Update CHANGELOG for v0.17.4 and remove .md files in doc/changelog.d.

Caution

Do not merge this pull request until the release has been successfully made.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.29%. Comparing base (0e05f78) to head (a0b84c0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6306   +/-   ##
=======================================
  Coverage   85.29%   85.29%           
=======================================
  Files         173      173           
  Lines       65310    65310           
=======================================
  Hits        55705    55705           
  Misses       9605     9605           

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