Draft: Add an eslint rule to enforce async\await when using nextTick

What does this MR do and why?

This MR intends to increase conformity to the async\await RFC for frontend testing. In order to do that several eslint rules were added to restrict undesired common code patterns regarding nextTick.

Cases that this MR intends to handle:

• Returning nextTick to indicate an async callback:
  • return nextTick();
  • return nextTick;
  • .then(() => nextTick)
  • .then(() => nextTick())
• Using nextTick thenable interface:
  • nextTick().then(callback)
• Using nextTick callback:
  • nextTick(callback)

The preferred way of using nextTick within frontend tests should now be async\await:

it('...', async () => {
  // ...
  await nextTick();
  // ...
})

This MR also touches on the frontend testing code quality improvement initiative.

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