Add aliases to glimmer-js and glimmer-ts

[ijlee2]

Description

Patches #6630 and #6680.

While the terms "Glimmer JS" and "Glimmer TS" do currently appear in public repos in the context of parsers, I think these terms are technical and not what Ember developers would colloquially refer to files with <template> tags. Rather, we refer to gjs and gts, respectively.

Example: Ember's official tutorial doesn't mention "Glimmer JS" or "Glimmer TS."

Examples of more technical documentations:

• https://github.com/ember-cli/ember-template-imports/tree/v4.4.0-ember-template-imports?tab=readme-ov-file#using-template-tags-and-gjsgts-files
• https://rfcs.emberjs.com/id/1046-template-tag-in-routes/

I added the aliases key to these 2 languages, in particular, to ease writing code blocks on GitHub. Once this pull request is approved and released, developers would be able to write the following:

- ```glimmer-js
+ ```gjs
const Hello = <template>
  <div>Hello, {{@name}}!</div>
</template>;

export default Hello;
```

- ```glimmer-ts
+ ```gts
interface HelloSignature {
  Args: {
    name: string;
  }
}

const Hello: HelloSignature = <template>
  <div>Hello, {{@name}}!</div>
</template>;

export default Hello;
```

Checklist:

• I am adding new or changing current functionality
  • I have added or updated the tests for the new or changed functionality.

[lildude]

See inline comment.

[ijlee2]

I have a question. In the main branch, lib/linguist/languages.yml#L3684 lists gjs as a possible interpreter for JavaScript (introduced in #4783). Would this create a conflict with the alias gjs for *.gjs files?

(Currently on GitHub, code blocks with gjs language do get syntax highlighting, but not gts. I wonder if the discrepancy in behavior is due to gjs having been listed in interpreters.)

[lildude]

Would this create a conflict with the alias gjs for *.gjs files?

No. The gjs codeblocks are being correctly rendered due to the Glimmer JS entry as this is the only language with this extension.

The gts blocks are being detected as Gerber because there are two languages with this extension but it appears the heuristic isn't being used to differentiate so it's going on the first result for some reason:

Codeblocks are rendered using the markup library which feeds off linguist, but isn't really maintained much these days. I'm not very familiar with this how markup works, but this should improve things.

[lildude]

LGTM. Thanks.

Important

The changes in this PR will not appear on GitHub until the next release has been made and deployed. See here for more details.

[ijlee2]

@lildude Thank you for your prompt response and help with looking into what may be happening differently between gjs and gts. 🎉