Remove deprecated methods in Utils class

[manusa]

Description

Part of #5778

The following methods must be removed from Utils:

• getPluralFromKind(String kind)
  

  kubernetes-client/kubernetes-client-api/src/main/java/io/fabric8/kubernetes/client/utils/Utils.java

  Lines 350 to 351 in e0647d7

  	@Deprecated
  	public static String getPluralFromKind(String kind) {

Dependencies must be updated accordingly.

[stale]

This issue has been automatically marked as stale because it has not had any activity since 90 days. It will be closed if no further activity occurs within 7 days. Thank you for your contributions!

[vaidikcode]

@manusa, how should we handle the use of this method in kubernetes-client-api/src/main/java/io/fabric8/kubernetes/client/dsl/base/ResourceDefinitionContext.java within the protected void validate method?

[manusa]

This needs to be evaluated:

• Expose method that computes the default plural form for a given kind #6313
• feat: add getDefaultPluralFor method #6314

It's unclear if we still want to remove it or not.