[pytest] Reverse PT001 and PT0023 defaults (#12106)

## Summary

This patch inverts the defaults for
[pytest-fixture-incorrect-parentheses-style
(PT001)](https://docs.astral.sh/ruff/rules/pytest-fixture-incorrect-parentheses-style/)
and [pytest-incorrect-mark-parentheses-style
(PT003)](https://docs.astral.sh/ruff/rules/pytest-incorrect-mark-parentheses-style/)
to prefer dropping superfluous parentheses.

Presently, Ruff defaults to adding superfluous parentheses on pytest
mark and fixture decorators for documented purpose of consistency; for
example,

```diff
 import pytest


-@pytest.mark.foo
+@pytest.mark.foo()
 def test_bar(): ...
```

This behaviour is counter to the official pytest recommendation and
diverges from the flake8-pytest-style plugin as of version 2.0.0 (see
https://github.com/m-burst/flake8-pytest-style/issues/272). Seeing as
either default satisfies the documented benefit of consistency across a
codebase, it makes sense to change the behaviour to be consistent with
pytest and the flake8 plugin as well.

This change is breaking, so is gated behind preview (at least under my
understanding of Ruff versioning). The implementation of this gating
feature is a bit hacky, but seemed to be the least disruptive solution
without performing invasive surgery on the `#[option()]` macro.

Related to #8796.

### Caveat

Whilst updating the documentation, I sought to reference the pytest
recommendation to drop superfluous parentheses, but couldn't find any
official instruction beyond it being a revealed preference within the
pytest documentation code examples (as well as the linked issues from a
core pytest developer). Thus, the wording of the preference is
deliberately timid; it's to cohere with pytest rather than follow an
explicit guidance.

## Test Plan

`cargo nextest run`

I also ran

```sh
cargo run -p ruff -- check crates/ruff_linter/resources/test/fixtures/flake8_pytest_style/PT001.py --no-cache --diff --select PT001
```

and compared against it with `--preview` to verify that the default does
change under preview (I also repeated this with `echo
'[tool.ruff]\npreview = true' > pyproject.toml` to verify that it works
with a configuration file).

---------

Co-authored-by: Charlie Marsh <charlie.r.marsh@gmail.com>

crates/ruff_workspace/src/options.rs

@@ -24,7 +24,7 @@ use ruff_linter::rules::{
     pycodestyle, pydocstyle, pyflakes, pylint, pyupgrade,
 };
 use ruff_linter::settings::types::{
-    IdentifierPattern, OutputFormat, PythonVersion, RequiredVersion,
+    IdentifierPattern, OutputFormat, PreviewMode, PythonVersion, RequiredVersion,
 };
 use ruff_linter::{warn_user_once, RuleSelector};
 use ruff_macros::{CombineOptions, OptionsMetadata};
@@ -1374,6 +1374,9 @@ pub struct Flake8PytestStyleOptions {
     /// default), `@pytest.fixture()` is valid and `@pytest.fixture` is
     /// invalid. If set to `false`, `@pytest.fixture` is valid and
     /// `@pytest.fixture()` is invalid.
+    ///
+    /// If [preview](https://docs.astral.sh/ruff/preview/) is enabled, defaults to
+    /// `false`.
     #[option(
         default = "true",
         value_type = "bool",
@@ -1457,6 +1460,9 @@ pub struct Flake8PytestStyleOptions {
     /// default), `@pytest.mark.foo()` is valid and `@pytest.mark.foo` is
     /// invalid. If set to `false`, `@pytest.fixture` is valid and
     /// `@pytest.mark.foo()` is invalid.
+    ///
+    /// If [preview](https://docs.astral.sh/ruff/preview/) is enabled, defaults to
+    /// `false`.
     #[option(
         default = "true",
         value_type = "bool",
@@ -1466,9 +1472,12 @@ pub struct Flake8PytestStyleOptions {
 }
 
 impl Flake8PytestStyleOptions {
-    pub fn try_into_settings(self) -> anyhow::Result<flake8_pytest_style::settings::Settings> {
+    pub fn try_into_settings(
+        self,
+        preview: PreviewMode,
+    ) -> anyhow::Result<flake8_pytest_style::settings::Settings> {
         Ok(flake8_pytest_style::settings::Settings {
-            fixture_parentheses: self.fixture_parentheses.unwrap_or(true),
+            fixture_parentheses: self.fixture_parentheses.unwrap_or(preview.is_disabled()),
             parametrize_names_type: self.parametrize_names_type.unwrap_or_default(),
             parametrize_values_type: self.parametrize_values_type.unwrap_or_default(),
             parametrize_values_row_type: self.parametrize_values_row_type.unwrap_or_default(),
@@ -1494,7 +1503,7 @@ impl Flake8PytestStyleOptions {
                 .transpose()
                 .map_err(SettingsError::InvalidRaisesExtendRequireMatchFor)?
                 .unwrap_or_default(),
-            mark_parentheses: self.mark_parentheses.unwrap_or(true),
+            mark_parentheses: self.mark_parentheses.unwrap_or(preview.is_disabled()),
         })
     }
 }