When quarto edits `.gitignore` in an R package, it should probably also check/modify `.Rbuildignore`

Bug description

I've been playing with the use of quarto and the quarto extension to preview .[R]?md files in an R package. The most typical targets are:

• NEWS.md
• README.Rmd or README.md
• vignettes/whatever.Rmd

quarto preview adds /.quarto/ to the local .gitignore, i.e. to the top-level .gitignore in the first 2 cases above and to vignettes/.gitignore in the last case. Related issue: #9744.

I think quarto also needs to add an entry to .Rbuildignore in this scenario, if a relevant entry isn't already there. If you don't, R CMD check shows:

N  checking for hidden files and directories ...
   Found the following hidden files and directories:
     .quarto
     vignettes/.quarto
   These were most likely included in error. See section ‘Package
   structure’ in the ‘Writing R Extensions’ manual.

Here's the entry you'd want to add to .Rbuildignore if it's not already present:

^\.quarto$

(I can also add something to usethis, so that this is pre-populated if usethis does the project setup, going forward, but that's more of a gesture of moral support than an actual fix.)

Steps to reproduce

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Expected behavior

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Actual behavior

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Your environment

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Quarto check output

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