backport requests for 18.0.1

[Johan Vos]

Hi Kevin,

I request approval to backport the following issues to the jfx18 branch,
for JavaFX 18.0.1:

JDK-8278980: Update WebKit to 613.1
JDK-8281459: WebKit 613.1 build broken on M1
JDK-8281711: Cherry-pick WebKit 613.1 stabilization fixes
JDK-8282099: Cherry-pick WebKit 613.1 stabilization fixes (2)

- Johan