Fix instable formatting for trailing subscribt end-of-line comment (#10492)

## Summary

This PR fixes an instability where formatting a subscribt 
where the `slice` is not an `ExprSlice` and it has a trailing
end-of-line comment after its opening `[` required two formatting passes
to be stable.

The fix is to associate the trailing end-of-line comment as dangling
comment on `[` to preserve its position, similar to how Ruff does it for
other parenthesized expressions.
This also matches how trailing end-of-line subscript comments are
handled when the `slice` is an `ExprSlice`.

Fixes https://github.com/astral-sh/ruff/issues/10355

## Versioning

Shipping this as part of a patch release is fine because:

* It fixes a stability issue
* It doesn't impact already formatted code because Ruff would already
have moved to the comment to the end of the line (instead of preserving
it)

## Test Plan

Added tests

crates/ruff_python_formatter/resources/test/fixtures/ruff/expression/subscript.py

@@ -3,3 +3,29 @@ result = (
     f(111111111111111111111111111111111111111111111111111111111111111111111111111111111)
     + 1
 )[0]
+
+
+# Regression tests for: https://github.com/astral-sh/ruff/issues/10355
+repro(
+    "some long string that takes up some space"
+)[  # some long comment also taking up space
+    0
+]
+
+repro(
+    "some long string that takes up some space"
+)[0 # some long comment also taking up space
+]
+
+repro(
+    "some long string that takes up some space"
+)[0]  # some long comment also taking up space
+
+repro("some long string that takes up some space")[0]  # some long comment also taking up space
+
+
+repro(
+    "some long string that takes up some space"
+)[  # some long comment also taking up space
+0:-1
+]