ImageChangeTriggerEnricher 'containerToImageMap.size() != 0' can be replaced with '!containerToImageMap.isEmpty()'

[manusa]

Description

The call to Map.size can be replaced with isEmpty in ImageChangeTriggerEnricher.

The following line:

https://github.com/eclipse-jkube/jkube/blob/8aea35928d3f3157ffcfbd645001adfe4302bbb8/jkube-kit/enricher/generic/src/main/java/org/eclipse/jkube/enricher/generic/openshift/ImageChangeTriggerEnricher.java#L82

should be changed to:

                if (!containerToImageMap.isEmpty()) {

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