Add otel collector configdata annotations

[khewonc]

What does this PR do?

• Add annotations for otel configdata
• Use pointer receivers to match other features

Motivation

When changing configdata, the pod was not restarting to use the updated configmap data

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

• Create a DDA with otel enabled and configdata set. Example:

  datadog-operator/examples/datadogagent/datadog-agent-with-otel-agent.yaml

  Lines 17 to 48 in 1a69194

  	conf:
  	configData: |-
  	receivers:
  	otlp:
  	protocols:
  	grpc:
  	endpoint: 0.0.0.0:4317
  	http:
  	endpoint: 0.0.0.0:4318
  	exporters:
  	debug:
  	verbosity: detailed
  	datadog:
  	api:
  	key: ${env:DD_API_KEY}
  	processors:
  	batch:
  	connectors:
  	service:
  	pipelines:
  	traces:
  	receivers: [otlp]
  	processors: [batch]
  	exporters: [datadog]
  	metrics:
  	receivers: [otlp]
  	processors: [batch]
  	exporters: [datadog]
  	logs:
  	receivers: [otlp]
  	processors: [batch]
  	exporters: [datadog]

• Ensure the node agent pod and otel configmap (<dda-name>-otel-agent-config) have the same annotation checksum/otel_agent-custom-config: <md5-hash>
• Change the DDA otel configdata section and apply the changes. For example, change endpoint: 0.0.0.0:4317 to endpoint: 0.0.0.0:3333
• The node agent pod should restart. Ensure the new agent pod and otel configmap's checksum/otel_agent-custom-config has changed from the previous value
• Check that the changes from configdata are reflected in the otel agent by exec'ing into the otel-agent container and looking at the otel-config.yaml file:

kubectl exec -it -c otel-agent -- bash
cat /etc/datadog-agent/otel-config.yaml

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 66.66667% with 10 lines in your changes missing coverage. Please review.

Project coverage is 48.84%. Comparing base (bc3a576) to head (2798ece).

Files with missing lines	Patch %	Lines
...ller/datadogagent/feature/otelcollector/feature.go	66.66%	8 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1628      +/-   ##
==========================================
+ Coverage   48.82%   48.84%   +0.02%     
==========================================
  Files         217      217              
  Lines       20874    20894      +20     
==========================================
+ Hits        10191    10205      +14     
- Misses      10147    10151       +4     
- Partials      536      538       +2     

Flag	Coverage Δ
unittests	48.84% <66.66%> (+0.02%)	⬆️

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

Files with missing lines	Coverage Δ
...ller/datadogagent/feature/otelcollector/feature.go	86.50% <66.66%> (-2.31%)	⬇️

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