test(typescript-estree):[babel alignment] remove AST transformation of TSTypePredicate

[sosukesuzuki]

babel/babel#12352 and babel/babel#12167 remove the difference of AST. So we can remove transformation of TSTypePredicate.

[typescript-eslint]

Thanks for the PR, @sosukesuzuki!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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[bradzacher]

Thanks!