Create constant for 'data-reference-type'
The following discussion from !86708 (merged) should be addressed:
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@alexkalderimis started a discussion: (+2 comments) It might be nice to have a named constant for this - but that is not a blocker.
More interesting (and a possible follow-up) is that this is very slightly too broad, since the following MD will produce a document that we will (pointlessly) re-write:
Some fenced block: ``` <foo data-reference-type="x"/> ```
Do we want to care? Probably not - and parsing the string on the off-chance is not super worthwhile.