Lint proper use of jsx pragma

[kitsonk]

/** @jsxImportSource https://esm.sh/preact */
/** @jsx h */
/** @jsxFragment Fragment */

The above code works fine (it uses the @jsxImportSource) as expected. It is not obvious to users what should happen here though, so we should add a deno lint to disallow this. One or the other, not both.

Originally posted by @lucacasonato in denoland/deno#12631 (comment)