fix(@angular/build): print Sass @warn location

[alan-agius4]

When using the @warn directive, the span entry in the warning object is often undefined. Instead, the stack property is populated.

{
  "warnings": [
    {
      "deprecation": false,
      "deprecationType": null,
      "span": undefined,
      "stack": "projects/foo/src/app/app.component.scss 1:1  root stylesheet\n",
      "message": "some message"
    }
  ]
}

Before

▲ [WARNING] some message [plugin angular-sass]

Now

▲ [WARNING] some message [plugin angular-sass]

  projects/foo/src/app/app.component.scss 1:1  root stylesheet

Closes: #27726

[clydin]

This seems like a bug on the Sass side. If it can generate a stack trace, it knows the location or is it always at 1:1 in this case?
Maybe add a comment that this is a workaround for a lack of a warning location?

[alan-agius4]

This seems like a bug on the Sass side. If it can generate a stack trace, it knows the location or is it always at 1:1 in this case? Maybe add a comment that this is a workaround for a lack of a warning location?

It knows the location.

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}