fix(lint/useJsxKeyInIterable): flag jsx in variable declarations

[dyc3]

Summary

The rule will now catch snippets like below:

// invalid
[].map((item) => {
	const div = <div>{item}</div>;
	return div;
});

fully resolves #2590

Test Plan

Added more snapshot tests

cargo test -p biome_js_analyze use_jsx_key_in_iterable

[codspeed-hq]

CodSpeed Performance Report

Merging #2803 will not alter performance

_{Comparing dyc3:05-06-fix_lint_usejsxkeyiniterable_flag_jsx_in_variable_declarations (3931156) with main (7245146)}

Summary

✅ 97 untouched benchmarks

[ematipico]

Awesome! Just left some comments to polish the code, but the logic looks good

[ematipico]

I forgot to submit the comments... -.- hold on