docs: deprecation notice for agentrm features (#9344)

docs/release-notes/feature-clean-up.rst

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+
+**Deprecations**
+
+To enhance stability and streamline the onboarding process, we may remove the following features in
+future releases. Our goal is for Agent Resource Manager environments to function seamlessly
+out-of-the-box with minimal customization required.
+
+Agent Resource Manager:
+
+-  Container Runtimes: We will limit support to Docker for Agent Resource Managers.
+
+-  Job Scheduling: Moving a job will require adjusting its priority; jobs cannot be shifted within
+   the same priority group. Support for round-robin and fair share schedulers is discontinued. We
+   recommend using the priority scheduler, as it meets most scheduling needs and simplifies
+   configuration.
+
+-  AMD GPUs: Support will continue only for Nvidia GPUs.
+
+Machine Architectures: PPC64/POWER builds across all environments are no longer supported.