Add changelog note

Author: cognifloyd

docs/notes/2.23.x.md

@@ -26,6 +26,13 @@ Source files no longer produce a dependency on Scala plugins. If you are using a
 
 [The `pants.backend.experimental.python.typecheck.pyright` backend](https://www.pantsbuild.org/2.23/reference/subsystems/pyright) now uses version 1.1.365 by default.
 
+A new `entry_point_dependencies` field is now available for `python_tests` and `python_test` targets. This allows tests
+to depend on a subset (or all) of the `entry_points` defined on `python_distribution` targets. A dependency defined in
+`entry_point_dependencies` emulates an editable install of those `python_distribution` targets. Instead of including
+all of the `python_distribution`'s sources, only the specified entry points are made available. The entry_points metadata
+is also installed in the pytest sandbox so that tests (or the code under test) can load that metadata via `pkg_resources`.
+To use this, enable the `pants.backend.experimental.python` backend.
+
 ### Plugin API changes
 
 Fixed bug with workspace environment support where Pants used a workspace environment when it was searching for a local environment.