VS Code Extension: Don't turn off highlighting of "invisible characters"

Bug description

In the VS Code Extension, for some unknown reason the extension ships with

      "[quarto]": {
        "editor.unicodeHighlight.ambiguousCharacters": false,
        "editor.unicodeHighlight.invisibleCharacters": false
      },

https://github.com/quarto-dev/quarto/blob/faef822a085df65809adf55fb77c273e9cdb87b9/apps/vscode/package.json#L958

I git blamed my way back but they seem to be tied to the "great migration" commit which is not useful for gaining context about why this is set
https://github.com/quarto-dev/quarto/commit/0afac7beaf0924099519235eec51102155599270

I believe that "editor.unicodeHighlight.invisibleCharacters": false is particularly harmful, as it prevents non-breaking spaces from being highlighted. I'd argue that if non-breaking spaces were highlighted, then this user would have been able to figure out their problem much faster:
https://github.com/posit-dev/air/issues/381

Here are the docs for these two settings, I vote we remove the contributed configuration for both of these entirely:

This also aligns with my general principle that extensions should ship as minimal amount of contributed configuration as possible, because it will often just confuse users otherwise.

Steps to reproduce

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Actual behavior

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Expected behavior

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Your environment

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Open apps/vscode/package.json and inspect the contributed [quarto] configuration near line 958. Remove the settings for ambiguousCharacters and invisibleCharacters, then verify that the extension no longer overrides VS Code's unicode highlighting defaults.