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

Use custom DCA image: docker.io/adelhajhassan918/dca-test-tracing:latest (built from main for 7.64)

Same testing plan as this

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

You should add the labels/annotations as tags configuration for ingresses. For example:

apiVersion: datadoghq.com/v2alpha1
kind: DatadogAgent
metadata:
  name: datadog
  namespace: system
spec:
  global:
    credentials:
      apiSecret:
        secretName: datadog-secret
        keyName: api-key
    kubelet:
      tlsVerify: false
    kubernetesResourcesLabelsAsTags:
      ingresses.networking.k8s.io:
        foo: foo
        bar: bar
  override:
    clusterAgent:
      image:
        name: docker.io/adelhajhassan918/dca-test-tracing:latest

    kubernetesResourcesAnnotationsAsTags:
      daemonsets.apps:
        agent.datadoghq.com/agentspechash: hash
      ingresses.networking.k8s.io:
        test.test: test
        test: test2
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
  name: example-ingress
  namespace: system
  annotations:
    test.test: hello
    test: hello2
  labels:
    foo: bar
    bar: baz
spec:
  rules:
    - host: example.com
      http:
        paths:
          - path: /
            pathType: Prefix
            backend:
              service:
                name: example-service
                port:
                  number: 80

Then check the that the tags are found in the cluster agent tagger with agent tagger-list:

=== Entity kubernetes_metadata://networking.k8s.io/ingresses/system/example-ingress ===
== Source workloadmeta-kubernetes_metadata =
=Tags: [bar:baz foo:bar test2:hello2 test:hello]
===

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 (8e19e49).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1697      +/-   ##
==========================================
- Coverage   49.33%   49.30%   -0.03%     
==========================================
  Files         219      219              
  Lines       21314    21298      -16     
==========================================
- Hits        10515    10501      -14     
+ 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	11.82% <100.00%> (-3.89%)	⬇️

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