Add telemetry comment and errorCount metric for connection removal

[Copilot]

Addresses feedback on #398 regarding telemetry handling when multiple connection deletions fail.

Changes

• Added comment explaining intentional capture of last error details when multiple deletions fail
• Added errorCount metric to telemetry measurements to provide context on total failure count

// Note: When multiple deletions fail, we intentionally capture only the last error's
// details in telemetry. The errorCount metric below provides context on total failures.
context.telemetry.properties.error = 'RemoveConnectionError';
context.telemetry.properties.errorMessage = error instanceof Error ? error.message : String(error);

// ...after loop
context.telemetry.measurements.errorCount = failureCount;

The errorCount metric is a derived value but adds useful context alongside the existing connectionsToDelete and connectionsDeleted measurements.

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