Add two ports to service, daemonset and servicemonitor conditionally

[marevers]

Closes #1165

Instead of having a Service with single port and having to choose whether that is the Prometheus metrics or the internal metrics port, this allows for having a single Service with either one or two ports. By default, for ease of use, these are using the values from the Beyla config .Values.config.data.prometheus_export.port and .Values.config.data.internal_metrics.prometheus.port but can be overridden.

In order to accommodate this change, in values.yaml the structure of the Service and ServiceMonitor sections were changed to have dedicated subproperties for the two ports.

The most minimal and easy way to use this change is to enable the Service (and possibly the ServiceMonitor) through the values and then set up the Beyla configuration, for example:

service:
  enabled: true
config:
  create: true
  name: ""
  data:
    prometheus_export:
      port: 9090
      path: /metrics
    internal_metrics:
      prometheus:
        port: 6060
        path: /internal/metrics
serviceMonitor:
  enabled: true

This will result in both the Service and ServiceMonitor being created and using the ports/paths specified in the Beyla config.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.23%. Comparing base (d0fe930) to head (bb1b1f5).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1168      +/-   ##
==========================================
+ Coverage   81.13%   81.23%   +0.10%     
==========================================
  Files         136      136              
  Lines       11431    11447      +16     
==========================================
+ Hits         9274     9299      +25     
+ Misses       1633     1623      -10     
- Partials      524      525       +1     

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k8s-integration-test	58.83% <ø> (-0.11%)	⬇️
oats-test	35.81% <ø> (-0.06%)	⬇️
unittests	53.50% <ø> (+0.13%)	⬆️

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[marevers]

I have added one more change that will only use the 'metrics' port for Service, Daemonset and ServiceMonitor if both prometheus_export and internal_metrics are using the same port in the Beyla config.

[mariomac]

LGTM!