Docs: Add what's new video (#95173)

docs/sources/whatsnew/whats-new-in-v11-3.md

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 Welcome to Grafana 11.3! Scenes-powered dashboards are now generally available and the Explore Logs plugin is now installed by default. The dashboard experience has also improved in other ways including the ability to trigger API calls from any canvas element with the new **Actions** option and an update to transformations so you can apply calculations to dynamic fields. We've also simplified the alert setup experience, added customizable announcement banners that admins can send to all users, and improved some default permissions.
 
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 For even more detail about all the changes in this release, refer to the [changelog](https://github.com/grafana/grafana/blob/main/CHANGELOG.md). For the specific steps we recommend when you upgrade to v11.3, check out our [Upgrade Guide](https://grafana.com/docs/grafana/<GRAFANA_VERSION>/upgrade-guide/upgrade-v11.3/).