[Dashboard] View source - DRAFT

[thomasneirynck]

Summary

Proof of concept for a "View Source"-button.

This PR is broken.

Checklist

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• Any text added follows EUI's writing guidelines, uses sentence case text and includes i18n support
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• Unit or functional tests were updated or added to match the most common scenarios
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[thomasneirynck]

TODO: this needs fixing. dashboard-code has shifted in the meantime.

[thomasneirynck]

closing in favor of #204140