Fix parsing group resource to allow groups with periods

[adel121]

What does this PR do?

Fixes bug in parsing group resource parsing that prevented parsing groups containing periods correctly.

Motivation

Fix the issue.

Additional Notes

Anything else we should know when reviewing?

Describe your test plan

Same testing plan as this

But, here we should test with a resource of which the api group contains periods.

For example, you can use this:

apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: example-ingress
  namespace: default
spec:
  rules:
  - host: example.com
    http:
      paths:
      - path: /
        pathType: Prefix
        backend:
          service:
            name: example-service
            port:
              number: 80

Checklist

• PR has at least one valid label: bug, enhancement, refactoring, documentation, tooling, and/or dependencies
• PR has a milestone or the qa/skip-qa label

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 49.30%. Comparing base (1c16822) to head (9900edb).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1697      +/-   ##
==========================================
- Coverage   49.33%   49.30%   -0.03%     
==========================================
  Files         219      219              
  Lines       21314    21299      -15     
==========================================
- Hits        10515    10502      -13     
+ Misses      10252    10250       -2     
  Partials      547      547              

Flag	Coverage Δ
unittests	49.30% <100.00%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...troller/datadogagent/feature/enabledefault/rbac.go	12.12% <100.00%> (-3.59%)	⬇️

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