fix(sqllab): Un-render deselected tabs

[etr2460]

SUMMARY

When you switch tabs in sql lab, we were keeping them all rendered in the dom, but hidden. This meant that everytime the sql lab redux state changed, we'd re-render all tabs that were viewed since the last page load. This prop is defined on antd tabs (https://ant.design/components/tabs/#API), and un-renders tabs that aren't currently selected, improving the perf of both switching tabs and updating the sql query being run.

TESTING INSTRUCTIONS

go to SQL Lab, change tabs and see the old tabs un-rendered from the DOM. Ensure all SQL Lab functionality still works

to: @kgabryje @ktmud @rusackas @john-bodley

[ktmud]

I wonder if it's worth setting this option to true only when there are a lot of tabs.

[etr2460]

@ktmud that's an interesting point, although i didn't see any significant perf regression to requiring a rerender in the dom when switching tabs (especially since all the tabs were being rerendered before this change when a tab switch happened).

We could certainly iterate here to try and find the best solution, although i suspect that it's more dependent on the content of each tab (does it have results, has it loaded tables in the selected schema, how long is the query in the ace editor) than the raw number of tabs