ruff_python_formatter: run existing tests with "dynamic" setting

This tests the "dynamic" line width mode. As with the fixed line width
setting, not much changes here since most of our code examples use very
short lines.

In a subsequent commit, we'll add more tests specifically targeted at
line width.

crates/ruff_python_formatter/resources/test/fixtures/ruff/docstring_code_examples.options.json

@@ -47,7 +47,7 @@
   },
   {
     "docstring_code": "enabled",
-    "docstring_code_line_width": 88,
+    "docstring_code_line_width": "dynamic",
     "indent_style": "space",
     "indent_width": 4
   }

crates/ruff_python_formatter/tests/snapshots/format@docstring_code_examples.py.snap

@@ -13682,7 +13682,7 @@ quote-style                = Double
 line-ending                = LineFeed
 magic-trailing-comma       = Respect
 docstring-code             = Enabled
-docstring-code-line-width  = 88
+docstring-code-line-width  = "dynamic"
 preview                    = Disabled
 ```
 
@@ -13926,7 +13926,9 @@ def doctest_long_lines():
     This won't get wrapped even though it exceeds our configured
     line width because it doesn't exceed the line width within this
     docstring. e.g, the `f` in `foo` is treated as the first column.
-    >>> foo, bar, quux = this_is_a_long_line(lion, giraffe, hippo, zeba, lemur, penguin, monkey)
+    >>> foo, bar, quux = this_is_a_long_line(
+    ...     lion, giraffe, hippo, zeba, lemur, penguin, monkey
+    ... )
 
     But this one is long enough to get wrapped.
     >>> foo, bar, quux = this_is_a_long_line(