fix(gpu): drop the redundant upgrade release note

The upgrade section restated what the deprecation notice already says, so
keep only the deprecation notice.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Author: mbertrone

releasenotes/notes/disable-gpu-ebpf-probes-by-default-52386987e7f3edee.yaml

@@ -4,11 +4,3 @@ deprecations:
     The eBPF probes for GPU Monitoring are deprecated and are now disabled by
     default. Set ``gpu_monitoring.enable_ebpf_probes`` to ``true`` in
     ``system-probe.yaml`` to keep using them.
-upgrade:
-  - |
-    Because the eBPF probes for GPU Monitoring are now disabled by default, the
-    ``gpu.process.core.usage`` metric is no longer collected by default: it is
-    the only GPU metric produced exclusively by those probes. The closest
-    replacement is ``gpu.process.sm_active``, which is collected through NVML.
-    Set ``gpu_monitoring.enable_ebpf_probes`` to ``true`` to restore the
-    previous behavior. All other GPU metrics are unaffected.