Remove unused methods from KubernetesResourceUtil

[rohanKanojia]

Component

JKube Kit

Task description

Description

While working on #1316, I noticed there are many methods in KubernetesResourceUtil that are not used anywhere. Maybe they were used in past but lost references during refactors.

• KubernetesResourceUtil.removeLabel
  
• KubernetesResourceUtil.containsLabelInMetadata
• KubernetesResourceUtil.isAppCatalogResource
• KubernetesResourceUtil.isNewerResource
• KubernetesResourceUtil.getDockerContainerID
• KubernetesResourceUtil.podHasContainerImage
  
• KubernetesResourceUtil.getBuildStatusPhase
  
• KubernetesResourceUtil.removeVersionSelector

I think we should remove these unused methods.

Expected Behavior

We shouldn't have that many unused methods in KubernetesResourceUtil

Acceptance Criteria

• Clean up KubernetesResourceUtil to remove unused methods

[anurag-rajawat]

@rohanKanojia can I work on this?

[anurag-rajawat]

@rohanKanojia there is one more unused method

KubernetesResourceUtil.getCreationTimestamp

do we need it or remove it?

[rohanKanojia]

You can remove this as well.