Respect generic Protocol in ellipsis removal (#9841)

Closes https://github.com/astral-sh/ruff/issues/9840.

crates/ruff_linter/resources/test/fixtures/flake8_pie/PIE790.py

@@ -207,3 +207,23 @@ class Repro:
     def stub(self) -> str:
         """Docstring"""
         ...
+
+
+class Repro(Protocol[int]):
+    def func(self) -> str:
+        """Docstring"""
+        ...
+
+    def impl(self) -> str:
+        """Docstring"""
+        return self.func()
+
+
+class Repro[int](Protocol):
+    def func(self) -> str:
+        """Docstring"""
+        ...
+
+    def impl(self) -> str:
+        """Docstring"""
+        return self.func()

crates/ruff_linter/src/rules/flake8_pie/rules/unnecessary_placeholder.rs

@@ -1,6 +1,7 @@
 use ruff_diagnostics::AlwaysFixableViolation;
 use ruff_diagnostics::{Diagnostic, Edit, Fix};
 use ruff_macros::{derive_message_formats, violation};
+use ruff_python_ast::helpers::map_subscript;
 use ruff_python_ast::whitespace::trailing_comment_start_offset;
 use ruff_python_ast::Stmt;
 use ruff_python_semantic::{ScopeKind, SemanticModel};
@@ -132,7 +133,7 @@ fn in_protocol_or_abstract_method(semantic: &SemanticModel) -> bool {
         ScopeKind::Class(class_def) => class_def
             .bases()
             .iter()
-            .any(|base| semantic.match_typing_expr(base, "Protocol")),
+            .any(|base| semantic.match_typing_expr(map_subscript(base), "Protocol")),
         ScopeKind::Function(function_def) => {
             ruff_python_semantic::analyze::visibility::is_abstract(
                 &function_def.decorator_list,

crates/ruff_linter/src/rules/flake8_pie/snapshots/ruff_linter__rules__flake8_pie__tests__PIE790_PIE790.py.snap

@@ -671,5 +671,8 @@ PIE790.py:209:9: PIE790 [*] Unnecessary `...` literal
 207 207 |     def stub(self) -> str:
 208 208 |         """Docstring"""
 209     |-        ...
+210 209 | 
+211 210 | 
+212 211 | class Repro(Protocol[int]):