test: update metrics count expectation after refactoring

Update the minimum expected unique dynamo_component_* metrics from 23 to 11
to reflect the current metric count.

This fixes the failing vllm e2e tests:
- test_serve_deployment[aggregated]
- test_serve_deployment[aggregated_lmcache]

Signed-off-by: Keiven Chang <keivenchang@users.noreply.github.com>

Author: keivenchang

tests/utils/payloads.py

@@ -274,9 +274,9 @@ def metric_pattern(name):
                 name=f"{prefix}_*",
                 pattern=lambda name: rf"^{prefix}_\w+",
                 validator=lambda value: len(set(value))
-                >= 23,  # 80% of typical ~29 metrics (excluding _bucket) as of 2025-10-22 (but will grow)
-                error_msg=lambda name, value: f"Expected at least 23 unique {prefix}_* metrics, but found only {len(set(value))}",
-                success_msg=lambda name, value: f"SUCCESS: Found {len(set(value))} unique {prefix}_* metrics (minimum required: 23)",
+                >= 11,  # 80% of typical ~17 metrics (excluding _bucket) as of 2025-12-02
+                error_msg=lambda name, value: f"Expected at least 11 unique {prefix}_* metrics, but found only {len(set(value))}",
+                success_msg=lambda name, value: f"SUCCESS: Found {len(set(value))} unique {prefix}_* metrics (minimum required: 11)",
                 multiline=True,
             ),
             MetricCheck(