Asciidoc floatreftarget fixes

[cscheid]

Closes #8055.

I'm not confident that we're generating the correct output here, but given the reported .qmd, our output in this branch is:

= Caption

<<tbl-fruit>> shows just how expensive fruit is these days.

[[tbl-fruit]]
.Various fruits and their prices
[cols=",>",options="header",]
|===
|fruit |price
|apple |2.05
|pear |1.37
|orange |3.09
|===

And if that’s not convincing, consider <<fig-fruit>>.

.Pretty convincing
[#fig-fruit]
image::8055_files/figure-asciidoc/mermaid-figure-1.png[Pretty convincing,width=550,height=133]

Fin.

[cderv]

Thanks ! Interesting to understand more about floatreftarget.

We probably need to more test case about what float.content - see my comment about the subfigures issues.