Add configmap preprocessor

[khewonc]

What does this PR do?

Adds a preprocessor for configmaps and moves ksm config md5 hash generation to preprocessor.
To generate the hash annotation, the following labels were added to the configmaps:

• operator.datadoghq.com/config-id: identifying id for the custom config, e.g. ksm. Used to create the annotation key for the hash
• operator.datadoghq.com/component.<componentName>: component name. Used to tell the operator which components the hash should be added to

Open to discussing different label names. The component label was chosen so that you could still search for specific component dependencies using kubectl get pod -l operator.datadoghq.com/component.clusterAgent and add multiple component labels to a pod

Motivation

What inspired you to submit this pull request?

Additional Notes

Anything else we should know when reviewing?

Minimum Agent Versions

Are there minimum versions of the Datadog Agent and/or Cluster Agent required?

• Agent: vX.Y.Z
• Cluster Agent: vX.Y.Z

Describe your test plan

Default KSM settings:

• Check that the cm and dca pod labels have the same hash annotation as each other
• Check that the cm has the labels operator.datadoghq.com/config-id=ksm and operator.datadoghq.com/component.clusterAgent=true

Override KSM config using configdata:

    kubeStateMetricsCore:
      conf:
        configData: |
          cluster_check: true
          init_config:
          instances:
            - skip_leader_election: true
              collectors:
              - pods

• Check that the cm and dca pod labels have the same hash annotation as each other and that it has changed from the previous test using default settings
• Check that the cm has the labels operator.datadoghq.com/config-id=ksm and operator.datadoghq.com/component.clusterAgent=true

Enable cluster checks runner:

    clusterChecks:
      enabled: true
      useClusterChecksRunners: true

• Check that the cm and dca pod labels have the same hash annotation as each other
• Check that the cm has the labels operator.datadoghq.com/config-id=ksm and operator.datadoghq.com/component.clusterAgent=true (not clusterChecksRunner)

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
• All commits are signed (see: signing commits)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 29.48718% with 55 lines in your changes missing coverage. Please review.
✅ Project coverage is 38.04%. Comparing base (b4b6e01) to head (ca228e4).

Files with missing lines	Patch %	Lines
...ternal/controller/datadogagent/store/preprocess.go	22.58%	23 Missing and 1 partial ⚠️
internal/controller/datadogagent/store/store.go	30.00%	7 Missing ⚠️
...datadogagentinternal/controller_reconcile_agent.go	0.00%	6 Missing ⚠️
...troller/datadogagent/controller_reconcile_agent.go	16.66%	4 Missing and 1 partial ⚠️
...ler/datadogagentinternal/component_clusteragent.go	0.00%	3 Missing ⚠️
...adogagentinternal/component_clusterchecksrunner.go	0.00%	3 Missing ⚠️
...ller/datadogagent/component_clusterchecksrunner.go	33.33%	1 Missing and 1 partial ⚠️
...adogagent/feature/kubernetesstatecore/configmap.go	80.00%	1 Missing and 1 partial ⚠️
pkg/constants/utils.go	0.00%	2 Missing ⚠️
pkg/kubernetes/const.go	0.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (29.48%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2489      +/-   ##
==========================================
- Coverage   38.09%   38.04%   -0.06%     
==========================================
  Files         299      299              
  Lines       25182    25227      +45     
==========================================
+ Hits         9594     9598       +4     
- Misses      14853    14895      +42     
+ Partials      735      734       -1     

Flag	Coverage Δ
unittests	38.04% <29.48%> (-0.06%)	⬇️

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

Files with missing lines	Coverage Δ
.../controller/datadogagent/component_clusteragent.go	72.61% <100.00%> (+1.01%)	⬆️
...atadogagent/feature/kubernetesstatecore/feature.go	78.76% <ø> (-0.50%)	⬇️
pkg/kubernetes/const.go	0.00% <0.00%> (ø)
...ller/datadogagent/component_clusterchecksrunner.go	76.62% <33.33%> (-1.76%)	⬇️
...adogagent/feature/kubernetesstatecore/configmap.go	95.00% <80.00%> (-2.23%)	⬇️
pkg/constants/utils.go	8.08% <0.00%> (-0.13%)	⬇️
...ler/datadogagentinternal/component_clusteragent.go	31.25% <0.00%> (-1.22%)	⬇️
...adogagentinternal/component_clusterchecksrunner.go	38.96% <0.00%> (-1.58%)	⬇️
...troller/datadogagent/controller_reconcile_agent.go	61.45% <16.66%> (-0.96%)	⬇️
...datadogagentinternal/controller_reconcile_agent.go	4.27% <0.00%> (-0.24%)	⬇️
... and 2 more

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