[cleanup] Move consts out of api/v2alpha1

[swang392]

What does this PR do?

moves constants not used in the CRDs out of the /api folder to:

• internal/controller/datadogagent/common/const.go if they are used in the controller and in multiple features
• a specific const.go file in a feature if it's used exclusively in one feature
• a new package pkg/constants/ if they are used in a package

Motivation

We don't need to have the constants in /api if they aren't relevant to the CRDs. Moving the constants closer to where they are used makes the code easier to maintain.

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

should have no effect, everything builds and runs as normal

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

Attention: Patch coverage is 79.01235% with 51 lines in your changes missing coverage. Please review.

Project coverage is 48.93%. Comparing base (98ae1c6) to head (361a791).

Files with missing lines	Patch %	Lines
...nternal/controller/datadogagent/override/global.go	33.33%	5 Missing and 1 partial ⚠️
...adogagent/component/clusterchecksrunner/default.go	0.00%	5 Missing ⚠️
...troller/datadogagent/controller_reconcile_agent.go	28.57%	5 Missing ⚠️
...oller/datadogagent/component/clusteragent/utils.go	0.00%	4 Missing ⚠️
...ntroller/datadogagent/feature/dogstatsd/feature.go	55.55%	4 Missing ⚠️
...controller/datadogagent/component/agent/default.go	80.00%	3 Missing ⚠️
pkg/condition/condition.go	0.00%	3 Missing ⚠️
...ntroller/datadogagent/component/objects/network.go	0.00%	2 Missing ⚠️
...ontroller/datadogagent/controller_reconcile_dca.go	33.33%	2 Missing ⚠️
...atadogagent/feature/admissioncontroller/feature.go	66.66%	2 Missing ⚠️
... and 14 more

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1639   +/-   ##
=======================================
  Coverage   48.93%   48.93%           
=======================================
  Files         217      217           
  Lines       20892    20892           
=======================================
  Hits        10223    10223           
  Misses      10129    10129           
  Partials      540      540           

Flag	Coverage Δ
unittests	48.93% <79.01%> (ø)

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

Files with missing lines	Coverage Δ
internal/controller/datadogagent/common/utils.go	83.33% <100.00%> (ø)
internal/controller/datadogagent/common/volumes.go	100.00% <100.00%> (ø)
...ler/datadogagent/component/clusteragent/default.go	96.89% <100.00%> (ø)
...rnal/controller/datadogagent/feature/cspm/const.go	100.00% <ø> (ø)
...al/controller/datadogagent/feature/cspm/feature.go	75.20% <100.00%> (ø)
...nal/controller/datadogagent/feature/cws/feature.go	79.55% <100.00%> (ø)
...ntroller/datadogagent/feature/ebpfcheck/feature.go	83.60% <100.00%> (ø)
...ller/datadogagent/feature/eventcollection/const.go	100.00% <ø> (ø)
...er/datadogagent/feature/eventcollection/feature.go	62.31% <100.00%> (ø)
...controller/datadogagent/feature/helmcheck/const.go	100.00% <ø> (ø)
... and 39 more

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