Reverse order of __contains__ arguments (#14424)

## Summary

Closes https://github.com/astral-sh/ruff/issues/14423.

crates/ruff_linter/resources/test/fixtures/pylint/unnecessary_dunder_call.py

@@ -100,3 +100,5 @@ class Thing:
 blah = lambda: {"a": 1}.__delitem__("a")  # OK
 
 blah = dict[{"a": 1}.__delitem__("a")]  # OK
+
+"abc".__contains__("a")

crates/ruff_linter/src/rules/pylint/rules/unnecessary_dunder_call.rs

@@ -248,7 +248,7 @@ impl DunderReplacement {
         match dunder_method {
             "__add__" => Some(Self::Operator("+", "Use `+` operator")),
             "__and__" => Some(Self::Operator("&", "Use `&` operator")),
-            "__contains__" => Some(Self::Operator("in", "Use `in` operator")),
+            "__contains__" => Some(Self::ROperator("in", "Use `in` operator")),
             "__eq__" => Some(Self::Operator("==", "Use `==` operator")),
             "__floordiv__" => Some(Self::Operator("//", "Use `//` operator")),
             "__ge__" => Some(Self::Operator(">=", "Use `>=` operator")),

crates/ruff_linter/src/rules/pylint/snapshots/ruff_linter__rules__pylint__tests__PLC2801_unnecessary_dunder_call.py.snap

@@ -1,6 +1,5 @@
 ---
 source: crates/ruff_linter/src/rules/pylint/mod.rs
-snapshot_kind: text
 ---
 unnecessary_dunder_call.py:4:7: PLC2801 [*] Unnecessary dunder call to `__add__`. Use `+` operator.
   |
@@ -1082,3 +1081,19 @@ unnecessary_dunder_call.py:92:16: PLC2801 Unnecessary dunder call to `__getattri
 94 |     def use_descriptor(self, item):
    |
    = help: Access attribute directly or use getattr built-in function
+
+unnecessary_dunder_call.py:104:1: PLC2801 [*] Unnecessary dunder call to `__contains__`. Use `in` operator.
+    |
+102 | blah = dict[{"a": 1}.__delitem__("a")]  # OK
+103 | 
+104 | "abc".__contains__("a")
+    | ^^^^^^^^^^^^^^^^^^^^^^^ PLC2801
+    |
+    = help: Use `in` operator
+
+ℹ Unsafe fix
+101 101 | 
+102 102 | blah = dict[{"a": 1}.__delitem__("a")]  # OK
+103 103 | 
+104     |-"abc".__contains__("a")
+    104 |+"a" in "abc"