[lab] Fix TabList type exports

[barlock]

This change exports TabListOwnProps to fix a typescript error when styling the TabList component.

Example:

export const StyledTabList = styled(TabList)({
  height: `min-content`,
  minHeight: `auto`,
  overflow: `visible`,
  [`.${tabsClasses.scroller}`]: {
    height: `fit-content`,
  },
});

Create's the following error:

TS4023: Exported variable `StyledTabList` has or is using name `TabListOwnProps` from external module

Exporting the type fixes the issue.

• I have followed (at least) the PR section of the contributing guide.

[mui-bot]

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[aarongarciah]

Hey @barlock I wasn't able to reproduce the TypeScript error https://codesandbox.io/p/sandbox/wizardly-montalcini-c7k3g7?file=/src/Demo.tsx. May I ask you to provide a reproduction?