Revert fspath deprecation

It is not clear yet how we should proceed with this deprecation
because `pytest.Item.reportinfo` is public API and returns a `py.path` object,
and is not clear how plugins and our examples should handle that.

Reverting just the deprecation aspect of #8251 so we can get a 7.0.0 release out.

We will reintroduce the deprecation later once we have a clear path moving forward with replacing `reportinfo`.

Closes #8445
Closes #8821

testing/test_collection.py

@@ -614,8 +614,7 @@ class TestSession:
         items2, hookrec = pytester.inline_genitems(item.nodeid)
         (item2,) = items2
         assert item2.name == item.name
-        with pytest.warns(DeprecationWarning):
-            assert item2.fspath == item.fspath
+        assert item2.fspath == item.fspath
         assert item2.path == item.path
 
     def test_find_byid_without_instance_parents(self, pytester: Pytester) -> None: