chore: update CHANGELOG for v0.70.1

[pyansys-ci-bot]

Update CHANGELOG for v0.70.1 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 v0.70.1 and remove obsolete per-entry Markdown fragments

Documentation:

• Update doc/source/changelog.rst with entries for the v0.70.1 release

Chores:

• Remove individual changelog markdown files in doc/changelog.d after consolidation

[sourcery-ai]

Reviewer's Guide

This PR consolidates and updates the project’s changelog for the v0.70.1 release in the master RST file and removes now-redundant per-entry markdown fragments from the changelog.d directory.

File-Level Changes

Change	Details	Files
Updated the consolidated changelog for v0.70.1	Bumped version header to v0.70.1 Merged recent maintenance, dependency, addition and fix notes Adjusted RST formatting for consistency	doc/source/changelog.rst
Removed obsolete per-entry markdown files	Deleted legacy changelog fragments Cleaned up doc/changelog.d directory	doc/changelog.d/3905.maintenance.md doc/changelog.d/3907.added.md doc/changelog.d/3909.maintenance.md doc/changelog.d/3910.dependencies.md doc/changelog.d/3911.dependencies.md doc/changelog.d/3913.added.md doc/changelog.d/3915.fixed.md doc/changelog.d/3918.fixed.md doc/changelog.d/3920.maintenance.md

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