chore: update CHANGELOG for v0.12.5

[pyansys-ci-bot]

Update CHANGELOG for v0.12.5 and remove .md files in doc/changelog.d.

Caution

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

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

🟢 Coverage ∅ diff coverage · +0.00% coverage variation

Metric	Results
Coverage variation	✅ +0.00% coverage variation (-1.00%)
Diff coverage	✅ ∅ diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (2088859)	3197	2568	80.33%
Head commit (2cd9a21)	3197 (+0)	2568 (+0)	80.33% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1590)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

_{TIP This summary will be updated as you push new changes. Give us feedback}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.32%. Comparing base (2088859) to head (2cd9a21).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1590   +/-   ##
=======================================
  Coverage   80.32%   80.32%           
=======================================
  Files          42       42           
  Lines        3197     3197           
=======================================
  Hits         2568     2568           
  Misses        629      629           

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[github-actions]

The documentation for this pull request will be available at https://mechanical.docs.pyansys.com/pull/1590. Please allow some time for the documentation to be deployed.