[BUG]: Core dump using otlp flusher

[ralf0131]

Describe the bug
Core dump using otlp flusher when modify the pipeline configuration file.

iLogtail Running Environment
Please provide the following information:

• ilogtail version: compiled from source code of the main branch

When modify the following configuration

enable: true
version: v2
inputs:
  - Type: service_otlp
    Protocals:
      GRPC:
        Endpoint: 0.0.0.0:4317
        MaxRecvMsgSizeMiB: 64
        MaxConcurrentStreams: 100
        ReadBufferSize: 1024
        WriteBufferSize: 1024
      HTTP:
        Endpoint: 0.0.0.0:4318
        MaxRecvMsgSizeMiB: 64
        ReadTimeoutSec: 10
        ShutdownTimeoutSec: 5
flushers:
  - Type: flusher_stdout
    OnlyStdout: true

to the following configuration

---
enable: true
version: v2
inputs:
  - Type: service_otlp
    Protocals:
      HTTP:
        Endpoint: 0.0.0.0:6666
        MaxRecvMsgSizeMiB: 64
        ReadTimeoutSec: 10
        ShutdownTimeoutSec: 5
flushers:
  - Type: flusher_otlp
    Traces:
      Endpoint: http://127.0.0.1:4318

It will trigger the Loongcollector process to crash.

• ilogtail.LOG:

• go_plugin.LOG

The following logs appear in a very high frequency:

2024-12-26 09:38:04 [WRN] [flusher_otlp.go:156] [IsReady] [otlp/1]      AlarmType:FLUSHER_READY_ALARM   otlp flusher is not ready, all gRPC conn is nil:logstore        :config otlp:
2024-12-26 09:38:04 [WRN] [flusher_otlp.go:156] [IsReady] [otlp/1]      AlarmType:FLUSHER_READY_ALARM   otlp flusher is not ready, all gRPC conn is nil:logstore        :config otlp:
2024-12-26 09:38:04 [WRN] [flusher_otlp.go:156] [IsReady] [otlp/1]      AlarmType:FLUSHER_READY_ALARM   otlp flusher is not ready, all gRPC conn is nil:logstore        :config otlp: