updated reat-router and mermaid, added notistack, ensure proper pruning of instances ssh conns, support lsp conn over jumphost, support multiple logins from same user (introduced sessions), fix ff websocket lag, fix terminal garbage control seq in xterm.js, ensure proper proxmox id/ip and node failure handling, support for individual JWT tokens

[srieger1]

• updated react-router
• changed to notistack
• switch color mode in mermaid
• delete leftover containers if environment does not exist in persister anymore
• ensure proper pruning of Firecracker and OpenStack instances if environment was already deleted in persister
• fix lag in ff on websocket connection, e.g., when switching terminals and also to start collab and languageClient in editor
• disabled redundant languageClient websocket close
• fixed cursor position after terminal restore
• added support for lsp connection over SSH jumphost
• added support for multiple sessions of a single user
• fixed terminal control sequence garbage with recent xterm.js
• support individual JWT token, support dashes in usernames
• ensured proper cleanup of consoles and ssh connections
• removed ssh conn related debug console log output
• ensured unique id and ip address for proxmox instances
• tolerate proxmox nodes being temporarily down
• proper error and connection sharing in sftp file handler