create_from_github() tweaks

[hadley]

• Don't need to force RStudio project creation if in positron
• Make it easier to install the dev dependencies

The second bullet is the most important here — I realised that 100% of the time I call create_from_github() the next function I call is pak::pak() in order to be able to actually run the tests. I think this is probably generally true, and installing a few extra packages shouldn't be harmful.

[hadley]

I'm finding the auto-install super helpful as I work through the testthat revdeps.

[DavisVaughan]

Both of these feel like wins to me for normal day to day usage of this function

I have definitely gotten in the habit of having to clear out RStudio specific info when I use create_from_github() from Positron on a non-RStudio project, so that feels like a win.

Notably, I do not think I would have used install_dependencies for my Claude Code adventures with dplyr revdeps. I specifically wanted to control the libpath where the dependencies were installed to, so I had to:

• create_from_github() to make pkg/
• Add pkg/.Rprofile which added a custom path to .libPaths()
• Then pak::pak()

So I would have needed to inject a step in the middle there.

But that's a rare use case, and I would still have been able to achieve this because I would have been able to just set install_dependencies = FALSE.