This implementation is incomplete in that we do not fully implement the
steps to match the given font against the fonts in the set.
This is used by fonts.google.com to load the fonts used for sample text.
(cherry picked from commit 9bdf2e928c448585a6349bef36d7cb98ccc0607b)
There was no need to use FlyString for error messages, and it just
caused a bunch of churn since these strings typically only existed
during the lifetime of the error.
(cherry picked from commit 175f3febb8037a440d4ead7347d3266ee3d345e1;
minorly amended to fix conflict in WebSocket.cpp due to serenity
not having the adapter class removal in LadybirdBrowser/ladybird#1671)
There is still some work to do with some of the underying methods
called inside this method (e.g is_css_connected) but this is a start.
(cherry picked from commit 14d62d7f31e49e021332f3e64e6ea4b285dcdd15)
