Add 'otelAgentGateway' to list of override targets

[agagniere]

What does this PR do?

The possible override keys were missing the otel gateway, added it.

Note that it is already documented here: https://docs.datadoghq.com/opentelemetry/setup/ddot_collector/install/kubernetes_gateway?tab=datadogoperator#deploying-a-standalone-gateway

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)

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.78%. Comparing base (d134930) to head (09bee53).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2790   +/-   ##
=======================================
  Coverage   38.78%   38.78%           
=======================================
  Files         309      309           
  Lines       26852    26852           
=======================================
  Hits        10414    10414           
  Misses      15658    15658           
  Partials      780      780           

Flag	Coverage Δ
unittests	38.78% <ø> (ø)

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[tbavelier]

#2790 (comment) is correct, the file should be changed in

datadog-operator/hack/generate-docs/v2alpha1_overrides.markdown

Line 5 in 6d158f7

The table below lists parameters that can be used to override default or global settings. Maps and arrays have a type annotation in the table; properties that are configured as map values contain a `[key]` element which should be replaced by the actual map key. `override` itself is a map with the following possible keys: `nodeAgent`, `clusterAgent`, or `clusterChecksRunner`. Other keys can be added, but they do not have any effect.

and then re-generated