backstage release v2.83.0-rc.1

Added

• (muster,ui-react) Add a page per MCP server and per tool in #2675 by @marians

Fixed

• (gs,kubernetes-react) Skip the KubeadmControlPlane fetch for managed control planes in #2652 by @luca-rui
• (kubernetes-react,gs,agent-platform) One error helper for every Kubernetes proxy request in #2671 by @marians
• (gs,kubernetes-react) Render the cluster About card without a control plane reference in #2673 by @marians
• (muster,agent-platform,gs) Hide single-option installation pickers, drop ad-hoc server add in #2638 by @Rotfuks

Full Changelog: https://github.com/giantswarm/backstage/compare/v2.82.2...v2.83.0-rc.1