GoTimeUtil 'duration.length() == 0' can be replaced with 'duration.isEmpty()'

[manusa]

Description

The call to String.length can be replaced with isEmpty in GoTimeUtil.

The following line: https://github.com/eclipse-jkube/jkube/blob/5da6068d7756784aef9569568ee80f98da97e296/jkube-kit/enricher/api/src/main/java/org/eclipse/jkube/kit/enricher/api/util/GoTimeUtil.java#L60

should be changed to:

        if (duration.isEmpty()) {

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