backstage release v0.40.0

Oct 9, 2024 Web UI backstage v0.40.0

In this release:

Usage tracking with TelemetryDeck was added.
GS plugins were renamed in preparation to publish them.
Backstage packages were updated to v1.31.3. See ./docs/releases/v0.40.0-changelog.md for more information.

This part of our documentation refers to our vintage product. The content may be not valid anymore for our current product. Please check our new documentation hub for the latest state of our docs.