backstage release v0.17.0

Added

• Add basic /healthcheck endpoint
• Add liveness and readiness probes checking for the /healthcheck endpoint

Changed

• GS plugin: Display link to commit on GitHub for deployment dev versions.
• GS plugin: Change GitOps UI link text in the deployment details pane.
• GS plugin: Make HelmRelease conditions in the deployment details pane collapsed by default.
• GS plugin: Display source and updated timestamp in the deployment details pane.

Fixed

• Add kubernetes plugin configuration to snail app-config.