chore: update CHANGELOG for v0.70.2

[pyansys-ci-bot]

Update CHANGELOG for v0.70.2 and remove .md files in doc/changelog.d.

Caution

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

Summary by Sourcery

Update the consolidated changelog for v0.70.2 and clean up obsolete changelog fragments.

Documentation:

• Revise doc/source/changelog.rst to include the v0.70.2 release notes.

Chores:

• Remove legacy markdown files in doc/changelog.d.

[ansys-reviewer-bot]

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[sourcery-ai]

Reviewer's Guide

This PR updates the consolidated CHANGELOG for the upcoming v0.70.2 release in reStructuredText format and cleans up obsolete markdown fragments by removing them from the doc/changelog.d directory.

File-Level Changes

Change	Details	Files
Consolidated and updated main changelog for v0.70.2	Inserted v0.70.2 release header with date Merged and formatted recent feature/bugfix notes Verified internal links and section ordering	doc/source/changelog.rst
Removed obsolete changelog fragments	Deleted merged markdown entries from changelog.d Cleaned up outdated documentation artifacts	doc/changelog.d/4010.miscellaneous.md doc/changelog.d/4042.fixed.md

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.15%. Comparing base (fdbc9ad) to head (135dc35).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4044      +/-   ##
==========================================
- Coverage   89.18%   89.15%   -0.04%     
==========================================
  Files         187      187              
  Lines       14993    14993              
==========================================
- Hits        13372    13367       -5     
- Misses       1621     1626       +5     

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