Backport maintenance/0.19.x changelog to master

[ndgrigorian]

This PR cherry-picks commits that update CHANGELOG.md from maintenance/0.19.x to master

• Have you provided a meaningful PR description?
• Have you added a test, reproducer or referred to an issue with a reproducer?
• Have you tested your changes locally for CPU and GPU devices?
• Have you made sure that new changes do not introduce compiler warnings?
• Have you checked performance impact of proposed changes?
• Have you added documentation for your changes, if necessary?
• Have you added your changes to the changelog?
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[github-actions]

Deleted rendered PR docs from intelpython.github.com/dpctl, latest should be updated shortly. 🤞

[github-actions]

Array API standard conformance tests for dpctl=0.19.0dev0=py310h93fe807_547 ran successfully.
Passed: 894
Failed: 2
Skipped: 118

[coveralls]

coverage: 88.233%. remained the same
when pulling d502a27 on backport-0.19.0-changelog-to-master
into 941df52 on master.