CHORE: update CHANGELOG for v0.16.2

[pyansys-ci-bot]

Update CHANGELOG for v0.16.2 and remove .md files in doc/changelog.d.

Caution

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

[ansys-reviewer-bot]

Thanks for opening a Pull Request. If you want to perform a review write a comment saying:

@ansys-reviewer-bot review

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.23%. Comparing base (48e53a3) to head (919432c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6164   +/-   ##
=======================================
  Coverage   85.22%   85.23%           
=======================================
  Files         169      169           
  Lines       64036    64036           
=======================================
+ Hits        54573    54578    +5     
+ Misses       9463     9458    -5     

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.