[CONTP-1340] Delete previous OTEL Gateway deployment to properly support name override

[tbavelier]

What does this PR do?

Like DCA/CCR, adds a cleanupOldOtelAgentGatewayDeployments to remove stale OTEL Gateway deployments, e.g. a user overrides the name, it should remove the default one

Motivation

Seamless experience for gateway the same as for DCA/CCR, name override should be properly supported

Additional Notes

It's based on #2635, so commit to review is 1d9fe7b

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

1. Deploy a DDA with spec.features.otelAgentGateway.enabled=true
2. You should see a dda-name-otel-agent-gateway deploy
3. Add spec.override.otelAgentGateway.name=foo
4. You should see a foo that is the otel agent gateway AND the dda-name-otel-agent-gateway deploy should not be present anymore

---

Also follow these steps to QA #2635 (commits on which the branch is based):

1. Deploy a basic DDA
2. Disable the clusterAgent component with an override spec.override.clusterAgent.disabled=true
   1. Verify the deployment is deleted
3. Remove the disable override and add a name spec.override.clusterAgent.name=foo
   1. A foo- deployment should be created
4. Add again the disable override and verify the foo deployment is cleaned up

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)