[workloadmeta/kubeapiserver] Add missing types to Delete() in reflectorStore

[davidor]

What does this PR do?

Fixes a bug in the kubeapiserver workloadmeta collector.

It doesn't delete kube metadata objects and shows an error like this one:

workloadmeta-kubeapiserver: unable to delete watch event object

I also added some test cases that cover this.

Describe how to test/QA your changes

Enable kubernetes metadata collection. Any object will do, for example, namespaces. You can use this config when deploying with the Helm chart:

datadog:
  kubelet:
    tlsVerify: false
clusterAgent:
  env:
    - name: DD_CLUSTER_AGENT_KUBE_METADATA_COLLECTION_ENABLED
      value: true
    - name: DD_CLUSTER_AGENT_KUBE_METADATA_COLLECTION_RESOURCES
      value: namespaces

Then create a namespace. For example: kubectl create namespace example and check that it shows in the cluster-agent datadog-cluster-agent workload-list. Then, delete the namespace and check that the error pasted above doesn't appear in the logs and the namespace no longer appears in datadog-cluster-agent workload-list.

[davidor]

Nodes and namespaces were migrated to the new generic collector, so they're no longer needed here.

[davidor]

/merge

[dd-devflow]

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[pr-commenter]

Test changes on VM

Use this command from test-infra-definitions to manually test this PR changes on a VM:

inv create-vm --pipeline-id=37490912 --os-family=ubuntu

Note: This applies to commit 810d210

[dd-devflow]

🚂 MergeQueue: pull request added to the queue

The median merge time in main is 25m.

Use /merge -c to cancel this operation!