[BUG] panic: sync: WaitGroup is reused before previous Wait has returned

[darwayne]

Agent Environment

• AWS Lambda ARM Environment
• Docker Lambda extension version: 68
• Go based binary
• Agent Version: 7.62.0 (based on the lambda extension version)

Describe what happened:
I am getting the following stack trace sporadically (note I see an open issue DataDog/datadog-lambda-extension#564 as well about this; and left a similar comment there)

panic: sync: WaitGroup is reused before previous Wait has returned

goroutine 4285 [running]:
sync.(*WaitGroup).Wait(0x4000397df0)
    /root/go/pkg/mod/golang.org/toolchain@v0.0.1-go1.23.3.linux-arm64/src/sync/waitgroup.go:120 +0xac
github.com/DataDog/datadog-agent/pkg/logs/pipeline.(*Pipeline).Flush(0x4000386820, {0x1e77650, 0x400037d7a0})
    /tmp/dd/datadog-agent/pkg/logs/pipeline/pipeline.go:121 +0x5c
github.com/DataDog/datadog-agent/pkg/logs/pipeline.(*provider).Flush(0x1?, {0x1e77650, 0x400037d7a0})
    /tmp/dd/datadog-agent/pkg/logs/pipeline/provider.go:209 +0x48
github.com/DataDog/datadog-agent/comp/logs/agent/agentimpl.(*logAgent).Flush(0x40003a0ea0, {0x1e77650, 0x400037d7a0})
    /tmp/dd/datadog-agent/comp/logs/agent/agentimpl/serverless.go:51 +0x94
github.com/DataDog/datadog-agent/pkg/serverless/daemon.(*Daemon).flushLogs(0x4000210960, {0x1e77650, 0x400037d7a0}, 0x400368aa50)
    /tmp/dd/datadog-agent/pkg/serverless/daemon/daemon.go:258 +0x1fc

created by github.com/DataDog/datadog-agent/pkg/serverless/daemon.(*Daemon).TriggerFlush in goroutine 4277
    /tmp/dd/datadog-agent/pkg/serverless/daemon/daemon.go:310 +0x154

Describe what you expected:
I expected to NOT see a panic in the datadog agent. As this panic is causing my lambda logic to fail

Steps to reproduce the issue:
Since this is a race condition I am not sure how to reproduce .. however I believe the culprits are

• in the pipeline.go here
  • this looks to be what the panic is referencing
• in batch_strategy.go here
  • note this is happening in new go routine here

Additional environment details (Operating System, Cloud provider, etc):