RuntimeMode.label field may be final

[manusa]

Description

The field RuntimeMode.label may be 'final'.

The following lines
https://github.com/eclipse/jkube/blob/5da6068d7756784aef9569568ee80f98da97e296/jkube-kit/config/resource/src/main/java/org/eclipse/jkube/kit/config/resource/RuntimeMode.java#L47

• should be changed to:

    private final String label;

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