[EDOT Collector] Fix otlp exporter depecation warning

[ltflb-bgdi]

After upgrading the otel-operator to 9.3.1, the collectors log deprecation warnings like this:

{"level":"warn","ts":"2026-02-27T10:18:27.274Z","caller":"builders/builders.go:40","msg":"\"otlp\" alias is deprecated; use \"otlp_grpc\" instead","resource":{"k8s.pod.name":"opentelemetry-kube-stack-cluster-stats-collector-5d6cbb95dprf5z","service.instance.id":"0b534457-c937-44dc-9259-6eef7cddb0c3","service.name":"elastic-otel-collector","service.version":"9.3.1"},"otelcol.component.id":"otlp/gateway","otelcol.component.kind":"exporter","otelcol.signal":"metrics"}

As reported from the warning, please change the values.yaml file to use otlp_grpc exporters instead of the deprecated otlp exporters.

[ebeahan]

ping @elastic/ingest-otel-data

[pickypg]

Note that this also occurs with otlphttp -> otlp_http.

{"level":"warn","ts":"2026-03-09T21:07:04.601Z","caller":"builders/builders.go:40","msg":"\"otlphttp\" alias is deprecated; use \"otlp_http\" instead","resource":{"service.instance.id":"0a3587be-3150-41d6-b1f2-c712139ad066","service.name":"elastic-otel-collector","service.version":"9.3.1"},"otelcol.component.id":"otlphttp","otelcol.component.kind":"exporter","otelcol.signal":"logs"}