Check references feature with new Pandoc --citeproc processing

[cderv]

From first tests based on the draft PR rstudio/rmarkdown#1916, the new citeproc processing does not output the same HTML as the filter did. This creates an issue with bookdown where references are not correctly relocated in each chapter as it should.

I assume default style for citation is not the same. We may want to provide another default CSL if we don't want to change the default one.

Originally posted by @cderv in rstudio/rmarkdown#1915 (comment)

[github-actions]

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