[flake8-comprehensions] Handle trailing comma in fixes for unnecessary-generator-list/set (C400,C401) (#15929)

The unsafe fixes for the rules [unnecessary-generator-list
(C400)](https://docs.astral.sh/ruff/rules/unnecessary-generator-list/#unnecessary-generator-list-c400)
and [unnecessary-generator-set
(C401)](https://docs.astral.sh/ruff/rules/unnecessary-generator-set/#unnecessary-generator-set-c401)
used to introduce syntax errors if the argument to `list` or `set` had a
trailing comma, because the fix would retain the comma after
transforming the function call to a comprehension.

This PR accounts for the trailing comma when replacing the end of the
call with a `]` or `}`.

Closes #15852

crates/ruff_linter/resources/test/fixtures/flake8_comprehensions/C400.py

@@ -16,6 +16,17 @@ list((2 * x for x in range(3)))
 list(((2 * x for x in range(3))))
 list((((2 * x for x in range(3)))))
 
+# Account for trailing comma in fix
+# See https://github.com/astral-sh/ruff/issues/15852
+list((0 for _ in []),)
+list(
+     (0 for _ in [])
+     # some comments
+     ,
+     # some more
+ )
+
+
 # Not built-in list.
 def list(*args, **kwargs):
     return None

crates/ruff_linter/resources/test/fixtures/flake8_comprehensions/C401.py

@@ -26,6 +26,16 @@ set((2 * x for x in range(3)))
 set(((2 * x for x in range(3))))
 set((((2 * x for x in range(3)))))
 
+# Account for trailing comma in fix
+# See https://github.com/astral-sh/ruff/issues/15852
+set((0 for _ in []),)
+set(
+    (0 for _ in [])
+    # some comments
+    ,
+    # some more
+)
+
 # Not built-in set.
 def set(*args, **kwargs):
     return None