Breaking test for SVG

[machty]

Issue reported in Discord that SVG is yielding incorrect diagnostics for attributes like class.

https://discord.com/channels/480462759797063690/1357364002258424059/1357394721999425748

@patricklx you did work on this stuff recently, do you see an obvious fix?

Undesired diagnostics from this breaking test:

[
        {
          "category": "error",
          "code": 2353,
          "end": {
            "line": 7,
            "offset": 14,
          },
          "start": {
            "line": 7,
            "offset": 9,
          },
          "text": "Object literal may only specify known properties, and 'xmlns' does not exist in type 'Partial<WithDataAttributes<SVGSVGElementAttributes>>'.",
        },
        {
          "category": "error",
          "code": 2353,
          "end": {
            "line": 9,
            "offset": 56,
          },
          "start": {
            "line": 9,
            "offset": 51,
          },
          "text": "Object literal may only specify known properties, and 'class' does not exist in type 'Partial<WithDataAttributes<SVGRectElementAttributes>>'.",
        },
      ]

[patricklx]

I think extends GenericAttributes might not be working correctly here?

glint/packages/template/-private/dsl/elements.d.ts

Line 687 in 5564fc2

interface SVGAElementAttributes extends GenericAttributes {