fix: handle azure platform in metrics service factory

[KUNDAN1334]

Closes #194

Fix
Added an explicit case 'azure': branch that:

Logs a clear console.info (not warn) explaining that metrics are intentionally disabled on Azure and directs users to Prometheus as the appropriate alternative
Returns null explicitly, making the intent clear rather than falling through

case 'azure':
  console.info('"azure" platform detected. Metrics disabled (use Prometheus for AKS).');
  return null;

Test

Added a regression test to metrics_service_factory_test.ts that:

• Simulates an AKS cluster with a real Azure providerID format
• Asserts getMetricsService() returns null
• Asserts console.warn is never called — this is the critical guard that would catch any future regression back to the old behaviour

[google-oss-prow]

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