test flake `validation::otlp::tests::test_otlp_traces_single_request`

[albertlockett]

Saw a test failure in this build https://github.com/open-telemetry/otel-arrow/actions/runs/19965107357/job/57254740922

Rerunning the job seemed to solve the problem.

For now this seems like a rare failure, so probably not urgent to fix. Opening this issue more for posterity.

        FAIL [   0.027s] (613/692) otap-df-pdata validation::otlp::tests::test_otlp_traces_single_request
  stdout ───

    running 1 test
    test validation::otlp::tests::test_otlp_traces_single_request ... FAILED

    failures:

    failures:
        validation::otlp::tests::test_otlp_traces_single_request

    test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 263 filtered out; finished in 0.01s
    
  stderr ───
    [Collector stderr] 2025-12-05T14:00:15.279Z	info	otelconftelemetry/metrics.go:25	Internal metrics telemetry disabled	{"resource": {"service.instance.id": "c0952c14-9977-4b01-8769-6582293b964c", "service.name": "otelarrowcol", "service.version": "0.45.0"}}
    [Collector stderr] 2025-12-05T14:00:15.280Z	info	service@v0.140.0/service.go:224	Starting otelarrowcol...	{"resource": {"service.instance.id": "c0952c14-9977-4b01-8769-6582293b964c", "service.name": "otelarrowcol", "service.version": "0.45.0"}, "Version": "0.45.0", "NumCPU": 4}
    [Collector stderr] 2025-12-05T14:00:15.280Z	info	extensions/extensions.go:40	Starting extensions...	{"resource": {"service.instance.id": "c0952c14-9977-4b01-8769-6582293b964c", "service.name": "otelarrowcol", "service.version": "0.45.0"}}
    [Collector stderr] 2025-12-05T14:00:15.281Z	error	graph/graph.go:439	Failed to start component	{"resource": {"service.instance.id": "c0952c14-9977-4b01-8769-6582293b964c", "service.name": "otelarrowcol", "service.version": "0.45.0"}, "error": "listen tcp 127.0.0.1:60988: bind: address already in use", "type": "Receiver", "id": "otlp"}
    [Collector stderr] 2025-12-05T14:00:15.281Z	info	service@v0.140.0/service.go:261	Starting shutdown...	{"resource": {"service.instance.id": "c0952c14-9977-4b01-8769-6582293b964c", "service.name": "otelarrowcol", "service.version": "0.45.0"}}
    [Collector stderr] 2025-12-05T14:00:15.281Z	info	extensions/extensions.go:68	Stopping extensions...	{"resource": {"service.instance.id": "c0952c14-9977-4b01-8769-6582293b964c", "service.name": "otelarrowcol", "service.version": "0.45.0"}}
    [Collector stderr] 2025-12-05T14:00:15.281Z	info	service@v0.140.0/service.go:275	Shutdown complete.	{"resource": {"service.instance.id": "c0952c14-9977-4b01-8769-6582293b964c", "service.name": "otelarrowcol", "service.version": "0.45.0"}}
    [Collector stderr] Error: cannot start pipelines: failed to start "otlp" receiver: listen tcp 127.0.0.1:60988: bind: address already in use
    [Collector stderr] 2025/12/05 14:00:15 collector server run finished with error: cannot start pipelines: failed to start "otlp" receiver: listen tcp 127.0.0.1:60988: bind: address already in use

    thread 'validation::otlp::tests::test_otlp_traces_single_request' (19940) panicked at crates/pdata/src/validation/scenarios.rs:34:13:
    Test failed: ChannelClosed { source: RecvError(()) }
    note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace