Unknown transaction.type with OTLP and GRPC Spans created by OTEL Java agent

[NicklasWallgren]

OpenTelemetry gRPC spans sent to the APM Server OTLP endpoint result in a derived transaction with a transaction.type set to unknown when the spans originate from the Java OpenTelemetry Agent.

APM Server version (apm-server version):
8.10.4

OTEL Java Agent version:
2.10.0

Expected Behavior:
Should have a transaction type of request.

Steps to reproduce:
Instrument an java application using the OTEL java agent - opentelemetry-java-instrumentation

Span Context from OTEL collector

collector-1  | Span #0
collector-1  |     Trace ID       : 680b29fae4704be1521db3b5ad307802
collector-1  |     Parent ID      : 
collector-1  |     ID             : c920c8bc47f87dca
collector-1  |     Name           : PATCH /hello
collector-1  |     Kind           : Server
collector-1  |     Start time     : 2024-12-13 09:43:50.941603596 +0000 UTC
collector-1  |     End time       : 2024-12-13 09:43:58.284177181 +0000 UTC
collector-1  |     Status code    : Unset
collector-1  |     Status message : 
collector-1  | Attributes:
collector-1  |      -> url.scheme: Str(http)
collector-1  |      -> thread.name: Str(tomcat-handler-0)
collector-1  |      -> network.protocol.version: Str(1.1)
collector-1  |      -> network.peer.port: Int(43701)
collector-1  |      -> user_agent.original: Str(Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36 Edg/131.0.0.0)
collector-1  |      -> http.route: Str(/hello)
collector-1  |      -> server.port: Int(8080)
collector-1  |      -> http.request.method: Str(PATCH)
collector-1  |      -> url.path: Str(/hello)
collector-1  |      -> thread.id: Int(50)
collector-1  |      -> network.peer.address: Str(192.168.65.1)
collector-1  |      -> server.address: Str(localhost)
collector-1  |      -> client.address: Str(192.168.65.1)
collector-1  |      -> http.response.status_code: Int(200)