GJS parsed as JSX

[NullVoxPopuli]

I believe this'd be fixed by using content-tag

• Use content-tag instead of ember-template-imports #655
  • (potentially) closes:
    • Bug?: "Unclosed element pre, when <pre> is mentioned in test name of gts test file #617
    • Use content-tag in @glint/environment-ember-template-imports #609
  • but (kinda) blocked on:
    • adding a transform callback function: For linting, we'd need to be able to emit a full AST, including nodes for the template embroider-build/content-tag#39 (comment)
      • started here: Transform callback embroider-build/content-tag#29
    • or having content-tag provide char-indexes for the parse result in addition to the existing byte-indexes
      • see: Template node has incorrect range if the template contains emoji or other multi-byte characters 💩 embroider-build/content-tag#45

Evidence:

[lint:types] app/templates/application.gjs:38:3 - error TS2657: JSX expressions must have one parent element.
[lint:types] 
[lint:types]  38   <template>
[lint:types]       ~~~~~~~~~~
[lint:types]  39     {{pageTitle "is Polaris ready yet?"}}
[lint:types]     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[lint:types] ... 
[lint:types]  97 
[lint:types]     
[lint:types]  98     <Footer />
[lint:types]     ~~~~~~~~~~~~~~
[lint:types] 
[lint:types] app/templates/application.gjs:39:17 - error TS1005: ',' expected.
[lint:types] 
[lint:types] 39     {{pageTitle "is Polaris ready yet?"}}

From: https://github.com/NullVoxPopuli/is-polaris-ready-yet/blob/40e70a330dcd94110910aa4dc1b29a757e90ec90/package.json#L31