Do not default CLC and DCA replica fields

[ahmed-mez]

What does this PR do?

Do not default CLC and DCA replicas

Motivation

Allow using a WPA or a HPA to autoscale the DCA and CLC deployments

Describe your test plan

Do not set the replicas field in the CR + deploy a WPA/HPA targeting the deployment:

• make sure the operator doesn't change deployment's spec and doesn't log any errors.
• make sure the HPA/WPA is able to autoscale the deployment
• apply some config changes to the runners in the DatadogAgent CR, make sure the deployment is updated accordingly but the replicas field managed by the HPA/WPA stays stable kg deploy datadog-cluster-checks-runner -ojson | jq .spec.replicas

[codecov-commenter]

Codecov Report

Merging #332 (0a04ffd) into main (5a31233) will decrease coverage by 0.00%.
The diff coverage is 37.50%.

@@            Coverage Diff             @@
##             main     #332      +/-   ##
==========================================
- Coverage   63.21%   63.20%   -0.01%     
==========================================
  Files          60       60              
  Lines        6606     6607       +1     
==========================================
  Hits         4176     4176              
- Misses       2126     2127       +1     
  Partials      304      304              

Flag	Coverage Δ
unittests	63.20% <37.50%> (-0.01%)	⬇️

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

Impacted Files	Coverage Δ
api/v1alpha1/datadogagent_default.go	78.82% <ø> (-0.24%)	⬇️
api/v1alpha1/datadogagent_types.go	100.00% <ø> (ø)
controllers/datadogagent/clusterchecksrunner.go	78.68% <0.00%> (-0.22%)	⬇️
controllers/datadogagent/clusteragent.go	69.79% <100.00%> (+0.02%)	⬆️
controllers/datadogagent/utils.go	82.79% <100.00%> (+0.06%)	⬆️

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[sarina-dd]

👍 docs