`jsx-no-leaked-render`: Don't report errors on empty strings if React >= v18

[karlhorky]

As mentioned and discussed here: #3203 (comment)

Modify the jsx-no-leaked-render rule to not report errors on empty strings if React is detected to be above or equal to v18, because React Native no longer throws on empty strings

Related docs PR: #3468

[himanshu007-creator]

hey, is this issue resolved now, if not i would like to give it a shot

[ljharb]

No, doesn’t seem to be. Go for it!

[karlhorky]

Thanks for #3488 @himanshu007-creator and @ljharb ! 🙌