docs: task config policies release note (#10087)

docs/release-notes/config-policies.rst

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+**New Features**
+
+-  Cluster: Add :ref:`config policies <config-policies>` to enable administrators to set limits on
+   how users can define workloads (e.g., experiments, notebooks, TensorBoards, shells, and
+   commands). Administrators can define two types of configurations:
+
+   -  **Invariant Configs for Experiments**: Settings applied to all experiments within a specific
+      scope (global or workspace). Invariant configs for other tasks (e.g. notebooks, TensorBoards,
+      shells, and commands) is not yet supported.
+
+   -  **Constraints**: Restrictions that prevent users from exceeding resource limits within a
+      scope. Constraints can be set independently for experiments and tasks.