[GR-39967] `findStaticVarHandle` folding can trigger initialization of user classes during the image build

[gradinac]

When performing a VarHandle lookup for a static field, native-image will fold the method call if the arguments are constant. However, this may trigger initialization of user classes. An example of such a lookup can be found in netty 5

Tracked internally by GR-39967.

[cstancu]

Fixed by #5156