Support syntax highlighting of `actions/github-script`

[TaxBusby]

Is your feature request related to a problem? Please describe.
actions/github-script is very helpful for writing clear logic in workflows, and I'm starting to use it more and more.

It is very convenient, it currently has no JS syntax highlighting for the code that I write.

Describe the solution you'd like
Automatically JS syntax-highlight script: inputs to uses: actions/github-script calls wherever they are found

The syntax highlighting should ideally include intellisense and other JS language features available in VSCode.

Additional context
Opened discussion on actions/github-script

[joshmgross]

I think this would be possible through https://code.visualstudio.com/api/language-extensions/embedded-languages

[felipesu19]

I think this is likely in the same place as having linting for bash scripts. We'd love to have it as a feature down the line, there are complexities involved in implementing and maintaining that make it more challenging than we can commit to right now.

[tdanecker]

I'd also really love to have syntax highlighting available for the javascript code itself via an embedded language (https://code.visualstudio.com/api/language-extensions/embedded-languages).

I think when the issue was moved to done, it was just for the highlighting of references in github expressions, but not for the javascript code itself?

It probably would make sense to reopen this issue instead of creating a new one for that feature request?