fix(telemetry): prevent OOM and crashes on export timeouts

[JoseSzycho]

Description: Updates OpenTelemetry configuration to improve stability during network issues or high load.

• Switch to gRPC Exporter: Replaces the incorrect HTTP package with @opentelemetry/exporter-trace-otlp-grpc to match implementation.

--Prevent OOM: Limits maxQueueSize (512) and maxExportBatchSize (128) to prevent memory exhaustion when the collector is unreachable.

• Error Handling: Adds a global unhandledRejection handler to log errors instead of crashing the process on exporter timeouts.
  Timeouts: Increases export timeout to 30s to reduce DEADLINE_EXCEEDED noice.

Related to:

• https://datum-inc.slack.com/archives/C084W6XRVS7/p1770672025274849