Add comprehensive obscure test cases for oxc_minifier peephole optimization

Co-authored-by: Boshen <1430279+Boshen@users.noreply.github.com>

Author: Copilot

crates/oxc_minifier/tests/ecmascript/complex_coercion.rs

@@ -1,8 +1,6 @@
 mod array_join;
-mod complex_coercion;
 mod is_int32_or_uint32;
 mod may_have_side_effects;
-mod obscure_edge_cases;
 mod prop_name;
 mod to_boolean;
 mod to_number;