[8.x](backport #6002) [helm] add support for creating services for agent presets

[mergify]

What does this PR do?

This PR introduces support for automatically creating Kubernetes services for specific Elastic Agent presets through the Helm chart. It adds a structured and scalable mechanism for managing and exposing agent instances within the Kubernetes cluster. This enhancement allows users to define service configurations (e.g., type, ports) for push-based integrations like NetFlow.

Key changes:

1. Added logic in the Helm chart to generate services for agent presets when specified in values.yaml.
2. Introduced configuration examples for creating a NodePort service linked to a NetFlow agent preset.
3. Updated schema definitions in values.schema.json to support new service and port configuration options.

Why is it important?

This enhancement simplifies the deployment and operational management of push-based integrations by allowing users to define and scale agent services directly through Helm configurations. By enabling Kubernetes service generation, this change:

• Streamlines access to agent instances.
• Supports various service types (e.g., ClusterIP, NodePort, LoadBalancer) to accommodate diverse user needs.

Checklist

• My code follows the style guidelines of this project
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files

Disruptive User Impact

This PR does not introduce disruptive changes, as service creation is optional and requires explicit configuration by users in values.yaml. By default, no services will be created unless configured.

How to test this PR locally

Follow the example introduced in this PR

Related issues

• Closes [helm] Create Kubernetes Service for Agent Presets #6012

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  This is an automatic backport of pull request [helm] add support for creating services for agent presets #6002 done by Mergify.

[michalpristas]

ping @pkoutsovasilis can you take a look at failures?

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarQube