Release notes for CU 7.9

[periclesrocha]

No description provided.

[prmerger-automator]

@periclesrocha : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[periclesrocha]

ATTENTION: Please hold off on publishing this PR until we have sign off from engineering

[learn-build-service-prod]

Learn Build status updates of commit 8cf9a96:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/analytics-platform-system/whats-new-analytics-platform-system.md	✅Succeeded

For more details, please refer to the build report.

[v-dirichards]

@periclesrocha Microsoft authors and contributors need to make content contributions through the private repository so the content can be staged and validated by the current validation rules.

After you make your changes in the private repo, review the articles on staging, and fix any validation issues, you can add the sign-off comment to let PR reviewers know that the updates are ready to be merged.

Read about authors working in the public repo for more information.

If you need help getting set up to work in the private repo, see Get started contributing to the Microsoft Learn platform.

We'll close this PR. Thank you.