Improved the error message when JSX syntax is found while not enabled.
The idea came from esbuild's error message ([esbuild try](https://esbuild.github.io/try/#dAAwLjI3LjAAAGV4cG9ydCBjb25zdCBmb28gPSA8Rm9vIC8+Ow)).
**Before**
```
x Unexpected token
,-[:1:20]
1 | export const foo = <Foo />;
: ^
`----
```
**After**
```
× Unexpected JSX expression
╭─[misc/fail/jsx-in-js.js:1:20]
1 │ export const foo = <Foo />;
· ───────
╰────
help: JSX syntax is disabled and should be enabled via the parser options
```
sapphi-red