fix(service): allow JSX syntax for javascript language id

[Sec-ant]

Summary

Allow JSX syntax in files with the javascript language id.

This is an ad hoc fix, because in the React world, .js files are allowed to include JSX syntax, and these files are often associated with the javascript language identifier in most of the editors. Plus, some editor extensions will also associate .jsx files with the javascript language identifier.

And we already allow JSX syntax in .js files when running from the CLI. This will make the LSP work more consistently with the CLI.

Relative links: discussion, #2085.

Test Plan

Tested locally in the editor with the extension.

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[ematipico]

Great catch! Can we add a new test?

[Sec-ant]

Great catch! Can we add a new test?

Done