Fix typo in otelLogsVolumeName variable

[Copilot]

Corrects misspelling of "Volume" as "Volumne" in variable name otelLogsVolumneName → otelLogsVolumeName.

Changes:

• Renamed variable in operator/handler/handler.go (3 occurrences: declaration and 2 usages)

// Before
otelLogsVolumneName := fmt.Sprintf(sidecarOtelLogsVolumeName, sidecarsCount)
pod.Spec.Volumes = append(pod.Spec.Volumes,
    corev1.Volume{
        Name: otelLogsVolumneName,
        ...
    })

// After  
otelLogsVolumeName := fmt.Sprintf(sidecarOtelLogsVolumeName, sidecarsCount)
pod.Spec.Volumes = append(pod.Spec.Volumes,
    corev1.Volume{
        Name: otelLogsVolumeName,
        ...
    })

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