Simplify check_device() for {ragg}/{svglite}

[teunbrand]

This PR amends #5350 and fixes #5470.

Briefly, the latest versions of {ragg}/{svglite} now support the dev.capabilities() method of querying their capabilities.
Therefore, we don't need to manually encode into the check what we know about the packages.
Instead, the check for {ragg}/{svglite} asks the user to install these versions and then resumes as normal.

Showing that it works:

devtools::load_all("~/packages/ggplot2")
#> ℹ Loading ggplot2
packageVersion("ragg")
#> [1] '1.2.6'

ragg::agg_png()

check_device("patterns")
#> [1] TRUE
check_device("compositing")
#> Warning: The agg_png device does not support compositing.
#> [1] FALSE

invisible(dev.off())
packageVersion("svglite")
#> [1] '2.1.2'

svglite::svglite()

check_device("patterns")
#> [1] TRUE
check_device("compositing")
#> Warning: The devSVG device does not support compositing.
#> [1] FALSE

^{Created on 2023-10-11 with reprex v2.0.2}

[thomasp85]

LGTM