backstage release v2.83.0

(muster,ui-react) Add a page per MCP server and per tool in #2675 by @marians
(muster) List MCP servers in one flat table with a server and tool search in #2676 by @marians
(muster,agent-platform) MCP Servers and Workflows as Agent Platform tabs in #2682 by @marians
(agent-platform) Show validate_agent’s notes on the review page in #2684 by @teemow
(muster,ui-react) Workflow page tabs Overview and Run in #2686 by @marians
(muster,ui-react) Server page tabs, a tools table, scroll to top on navigation in #2687 by @marians
(ai-chat) Move the frontend to ai@7 and assistant-ui 0.15 in #2688 by @marians
(gs,ai-chat-backend) Configure with AI in the Edit App Deployment template in #2689 by @marians

(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
(backend) Route native fetch through the GLOBAL_AGENT_* proxy in #2691 by @teemow

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