[CONTP-1569] Add KSM labels_as_tags / annotations_as_tags / tags to CRD

[zhuminyi]

Adds three additive fields to KubeStateMetricsCoreFeatureConfig that emit into the KSM check-instance YAML.

Field	Type	Default	Effect
labelsAsTags	map[string]map[string]string	nil	per-resource-kind label → Datadog-tag mapping (emits as labels_as_tags: in check instance)
annotationsAsTags	map[string]map[string]string	nil	per-resource-kind annotation → Datadog-tag mapping
tags	[]string	nil	static tags applied to all KSM metrics; emitted via YAML encoder so values with colons, slashes, or other YAML-special characters are quoted safely

Introduces a small writeYAMLBlock helper in configmap.go used by all three emission sites. No RBAC changes, no collector-list changes, no behavior change on upgrade for users who do not set any of the three new fields — the rendered ConfigMap is byte-identical
to today's output when the new fields are unset.

Example

DatadogAgent CR using the three new fields alongside the existing collectCrMetrics:

apiVersion: datadoghq.com/v2alpha1
kind: DatadogAgent
metadata:
  name: datadog
spec:
  features:
    kubeStateMetricsCore:
      enabled: true
      collectCrMetrics:                 # existing field — unchanged behavior
        - groupVersionKind:
            group: argoproj.io
            version: v1alpha1
            kind: Application
      labelsAsTags:                     # new
        pod:
          app: app
        node:
          zone: zone
      annotationsAsTags:                # new
        pod:
          tags_datadoghq_com_version: version  # KSM annotation-name transform applied
      tags:                             # new
        - env:prod
        - team:cont-p

Rendered KSM check instance (datadog-kube-state-metrics-core-config ConfigMap, new sections only — rest of instances[0] is byte-identical to today's output):

instances:
  - skip_leader_election: true
    collectors:
      ...   # unchanged
    labels_as_tags:
      pod:
        app: app
      node:
        zone: zone
    annotations_as_tags:
      pod:
        tags_datadoghq_com_version: version
    custom_resource:
      spec:
        resources:
          - groupVersionKind:
              group: argoproj.io
              version: v1alpha1
              kind: Application
    tags:
      - env:prod
      - team:cont-p

Notes

• Shape of labelsAsTags / annotationsAsTags matches the Helm chart (helm charts/charts/datadog/values.yaml) exactly so users can copy values between the two configs.

  // helm-chart config
  datadog:
    kubeStateMetricsCore:                  # <-- this section
      enabled: true
      collectCrMetrics: []                  # already in operator
      labelsAsTags: {}                      # ✅ this PR
      annotationsAsTags: {}                 # ✅ this PR 
      tags: []                              # ✅ this PR

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 41.00%. Comparing base (039572f) to head (bab3433).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2937      +/-   ##
==========================================
+ Coverage   40.69%   41.00%   +0.31%     
==========================================
  Files         321      324       +3     
  Lines       28413    29152     +739     
==========================================
+ Hits        11563    11955     +392     
- Misses      16015    16332     +317     
- Partials      835      865      +30     

Flag	Coverage Δ
unittests	41.00% <100.00%> (+0.31%)	⬆️

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

Files with missing lines	Coverage Δ
...adogagent/feature/kubernetesstatecore/configmap.go	97.64% <100.00%> (+0.42%)	⬆️
...atadogagent/feature/kubernetesstatecore/feature.go	80.95% <100.00%> (+1.69%)	⬆️
pkg/testutils/builder.go	4.00% <100.00%> (+4.00%)	⬆️

... and 14 files with indirect coverage changes

---

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[datadog-datadog-prod-us1-2]

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 41.06% (+0.04%)

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🔗 Commit SHA: bab3433 | Docs | Datadog PR Page | Give us feedback!}

[chatgpt-codex-connector]

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[drichards-87]

Left some suggestions from Docs and approved the PR.