[ruff] Check for non-context-manager use of pytest.raises, pytest.warns, and pytest.deprecated_call (RUF061) (#17368)

<!--
Thank you for contributing to Ruff! To help us out with reviewing,
please consider the following:

- Does this pull request include a summary of the change? (See below.)
- Does this pull request include a descriptive title?
- Does this pull request include references to any relevant issues?
-->

This PR aims to close #16605.

## Summary

This PR introduces a new rule (`RUF061`) that detects non-contextmanager
usage of `pytest.raises`, `pytest.warns`, and `pytest.deprecated_call`.
This pattern is discouraged and [was proposed in
flake8-pytest-style](https://github.com/m-burst/flake8-pytest-style/pull/332),
but the corresponding PR has been open for over a month without
activity.

Additionally, this PR provides an unsafe fix for simple cases where the
non-contextmanager form can be transformed into the context manager
form. Examples of supported patterns are listed in `RUF061_raises.py`,
`RUF061_warns.py`, and `RUF061_deprecated_call.py` test files.

The more complex case from the original issue (involving two separate
statements):
```python
excinfo = pytest.raises(ValueError, int, "hello")
assert excinfo.match("^invalid literal")
```
is getting fixed like this:
```python
with pytest.raises(ValueError) as excinfo:
    int("hello")
assert excinfo.match("^invalid literal")
```
Putting match in the raises call requires multi-statement
transformation, which I am not sure how to implement.

## Test Plan

<!-- How was it tested? -->

New test files were added to cover various usages of the
non-contextmanager form of pytest.raises, warns, and deprecated_call.

crates/ruff_linter/src/codes.rs

@@ -1027,6 +1027,7 @@ pub fn code_to_rule(linter: Linter, code: &str) -> Option<(RuleGroup, Rule)> {
         (Ruff, "058") => (RuleGroup::Preview, rules::ruff::rules::StarmapZip),
         (Ruff, "059") => (RuleGroup::Preview, rules::ruff::rules::UnusedUnpackedVariable),
         (Ruff, "060") => (RuleGroup::Preview, rules::ruff::rules::InEmptyCollection),
+        (Ruff, "061") => (RuleGroup::Preview, rules::ruff::rules::LegacyFormPytestRaises),
         (Ruff, "100") => (RuleGroup::Stable, rules::ruff::rules::UnusedNOQA),
         (Ruff, "101") => (RuleGroup::Stable, rules::ruff::rules::RedirectedNOQA),
         (Ruff, "102") => (RuleGroup::Preview, rules::ruff::rules::InvalidRuleCode),