Fix: refactored mismatching deletion resource types

[doronkg]

In cases where the resource type name mismatches in the following funcs, its deletion functionality will break:

# pkg/kor/<resource>s.go

func GetUnused<Resource>s()
	if opts.DeleteFlag {
          if diff, err = DeleteResource(diff, clientset, namespace, "<Resource>", opts.NoInteractive); err != nil {
          
# pkg/kor/delete.go

func DeleteResourceCmd()
        "<Resource>": func(clientset kubernetes.Interface, namespace, name string) error {

I've fixed the following mismatches in order to resolve #200:

• delete.go -> changed Roles to Role to match passed resource-type in roles.go.
• serviceaccountss.go -> changed Serviceaccount to ServiceAccount.
• statefulsets.go -> changed Statefulset to StatefulSet.

[codecov-commenter]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (47ec5b8) 44.43% compared to head (a34b248) 44.43%.

Files	Patch %	Lines
pkg/kor/delete.go	0.00%	3 Missing ⚠️
pkg/kor/serviceaccounts.go	0.00%	1 Missing ⚠️
pkg/kor/statefulsets.go	0.00%	1 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #201   +/-   ##
=======================================
  Coverage   44.43%   44.43%           
=======================================
  Files          29       29           
  Lines        2444     2444           
=======================================
  Hits         1086     1086           
  Misses       1205     1205           
  Partials      153      153           

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[yonahd]

Good catches
Thanks!