[OTAGENT-512] Add ManageOtelAgentGateway to Feature interface

[songy23]

What does this PR do?

Add ManageOtelAgentGateway to Feature interface. For now no features do anything concrete on otel agent gateway.

Motivation

Boilerplate code split from #2276 since #2276 is too large and is blocked by #2247

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

❌ Patch coverage is 0% with 67 lines in your changes missing coverage. Please review.
✅ Project coverage is 37.80%. Comparing base (24f1c33) to head (82a7dac).

Files with missing lines	Patch %	Lines
internal/controller/datadogagent/feature/types.go	0.00%	3 Missing ⚠️
...atadogagent/feature/admissioncontroller/feature.go	0.00%	2 Missing ⚠️
...nal/controller/datadogagent/feature/apm/feature.go	0.00%	2 Missing ⚠️
...nal/controller/datadogagent/feature/asm/feature.go	0.00%	2 Missing ⚠️
...roller/datadogagent/feature/autoscaling/feature.go	0.00%	2 Missing ⚠️
...ller/datadogagent/feature/clusterchecks/feature.go	0.00%	2 Missing ⚠️
...dogagent/feature/controlplanemonitoring/feature.go	0.00%	2 Missing ⚠️
...al/controller/datadogagent/feature/cspm/feature.go	0.00%	2 Missing ⚠️
...nal/controller/datadogagent/feature/cws/feature.go	0.00%	2 Missing ⚠️
...ntroller/datadogagent/feature/dogstatsd/feature.go	0.00%	2 Missing ⚠️
... and 23 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2315      +/-   ##
==========================================
- Coverage   37.91%   37.80%   -0.12%     
==========================================
  Files         258      258              
  Lines       21813    21878      +65     
==========================================
  Hits         8271     8271              
- Misses      12908    12973      +65     
  Partials      634      634              

Flag	Coverage Δ
unittests	37.80% <0.00%> (-0.12%)	⬇️

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

Files with missing lines	Coverage Δ
...atadogagent/feature/admissioncontroller/feature.go	66.06% <0.00%> (-0.49%)	⬇️
...nal/controller/datadogagent/feature/apm/feature.go	68.85% <0.00%> (-0.48%)	⬇️
...nal/controller/datadogagent/feature/asm/feature.go	72.41% <0.00%> (-2.59%)	⬇️
...roller/datadogagent/feature/autoscaling/feature.go	82.14% <0.00%> (-3.05%)	⬇️
...ller/datadogagent/feature/clusterchecks/feature.go	66.45% <0.00%> (-0.87%)	⬇️
...dogagent/feature/controlplanemonitoring/feature.go	14.07% <0.00%> (-0.15%)	⬇️
...al/controller/datadogagent/feature/cspm/feature.go	74.57% <0.00%> (-0.86%)	⬇️
...nal/controller/datadogagent/feature/cws/feature.go	78.07% <0.00%> (-0.85%)	⬇️
...ntroller/datadogagent/feature/dogstatsd/feature.go	68.87% <0.00%> (-0.93%)	⬇️
...l/controller/datadogagent/feature/dummy/feature.go	0.00% <0.00%> (ø)
... and 23 more

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[songy23]

e2e test failures are unrelated, they also fail in mainline: http://gitlab.ddbuild.io/DataDog/datadog-operator/-/jobs/1238451465

[gabedos]

lgtm