chore(web-console): UX improvements around editor

[insmac]

• Scrolling to error position in the editor
• Truncate query text in Notifications bar, add Copy CTA
• Switch the green "play" triangle in the editor margin to "stop" when query is running. clicking on the "stop" button will cancel.
• Proper multi-tab error support. Error markers (highlight + squiggly lines) in one tab should not spill over to the next one, they should be separate.
• Remove = as word delimiter, so that expressions like == can be highlighted as errors (since they can now be tokens)