Add metrics to gitops controller

[Tommy12789]

Refers to #2450

Introduced a new service for gitops metrics

[p-se]

Works as expected.

[0xavi0]

Don't we also need to expose the port and name it in the gitjob deployment?

For example:

spec:
      serviceAccountName: gitjob
      containers:
        - image: "{{ template "system_default_registry" $ }}{{ $.Values.image.repository }}:{{ $.Values.image.tag }}"
          name: gitjob
          {{- if $.Values.metrics.enabled }}
          ports:
          - containerPort: 8081
            name: metrics
          {{- end }}
          args:
          - fleetcontroller
          - gitjob