[pylint] Stabilize ignoring __init__.py for useless-import-alias (PLC0414) (#20271)

Stabilizes change from #18400. Removed gating, updated docs, updated
tests.

crates/ruff_linter/src/preview.rs

@@ -200,13 +200,6 @@ pub(crate) const fn is_allow_nested_roots_enabled(settings: &LinterSettings) ->
     settings.preview.is_enabled()
 }
 
-// https://github.com/astral-sh/ruff/pull/18400
-pub(crate) const fn is_ignore_init_files_in_useless_alias_enabled(
-    settings: &LinterSettings,
-) -> bool {
-    settings.preview.is_enabled()
-}
-
 // https://github.com/astral-sh/ruff/pull/18572
 pub(crate) const fn is_optional_as_none_in_union_enabled(settings: &LinterSettings) -> bool {
     settings.preview.is_enabled()

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

@@ -420,19 +420,6 @@ mod tests {
         Ok(())
     }
 
-    #[test]
-    fn preview_useless_import_alias() -> Result<()> {
-        let diagnostics = test_path(
-            Path::new("pylint/import_aliasing_2/__init__.py"),
-            &LinterSettings {
-                preview: PreviewMode::Enabled,
-                ..LinterSettings::for_rule(Rule::UselessImportAlias)
-            },
-        )?;
-        assert_diagnostics!(diagnostics);
-        Ok(())
-    }
-
     #[test]
     fn import_outside_top_level_with_banned() -> Result<()> {
         let diagnostics = test_path(

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

@@ -4,13 +4,11 @@ use ruff_macros::{ViolationMetadata, derive_message_formats};
 use ruff_text_size::Ranged;
 
 use crate::checkers::ast::Checker;
-use crate::preview::is_ignore_init_files_in_useless_alias_enabled;
 use crate::{Edit, Fix, FixAvailability, Violation};
 
 /// ## What it does
 /// Checks for import aliases that do not rename the original package.
-///
-/// In [preview] this rule does not apply in `__init__.py` files.
+/// This rule does not apply in `__init__.py` files.
 ///
 /// ## Why is this bad?
 /// The import alias is redundant and should be removed to avoid confusion.
@@ -35,8 +33,6 @@ use crate::{Edit, Fix, FixAvailability, Violation};
 /// ```python
 /// import numpy
 /// ```
-///
-/// [preview]: https://docs.astral.sh/ruff/preview/
 #[derive(ViolationMetadata)]
 pub(crate) struct UselessImportAlias {
     required_import_conflict: bool,
@@ -73,9 +69,7 @@ pub(crate) fn useless_import_alias(checker: &Checker, alias: &Alias) {
     }
 
     // A re-export in __init__.py is probably intentional.
-    if checker.path().ends_with("__init__.py")
-        && is_ignore_init_files_in_useless_alias_enabled(checker.settings())
-    {
+    if checker.path().ends_with("__init__.py") {
         return;
     }
 

crates/ruff_linter/src/rules/pylint/snapshots/ruff_linter__rules__pylint__tests__PLC0414_import_aliasing_2____init__.py.snap

@@ -1,18 +1,4 @@
 ---
 source: crates/ruff_linter/src/rules/pylint/mod.rs
 ---
-PLC0414 [*] Import alias does not rename original package
- --> __init__.py:1:8
-  |
-1 | import collections as collections
-  |        ^^^^^^^^^^^^^^^^^^^^^^^^^^
-2 | from collections import OrderedDict as OrderedDict
-3 | from . import foo as foo
-  |
-help: Remove import alias
-  - import collections as collections
-1 + import collections
-2 | from collections import OrderedDict as OrderedDict
-3 | from . import foo as foo
-4 | from .foo import bar as bar
-note: This is an unsafe fix and may change runtime behavior
+

crates/ruff_linter/src/rules/pylint/snapshots/ruff_linter__rules__pylint__tests__preview_useless_import_alias.snap

@@ -1,4 +0,0 @@
----
-source: crates/ruff_linter/src/rules/pylint/mod.rs
----
-