Fix metrics issues

[clyang82]

1. We need to start the metrics server no matter who is leader or not, because without metrics server, the pod will be shown as "Down" by prometheus when it scrapes the pod. refer to Serve metrics for non-leader pods kubernetes-sigs/controller-runtime#196
2. Avoid using init, because you cannot control it. for our case, we init the metrics before register to prometheus
3. introduce an annotation gh-metrics-scrape-interval allow resetting the interval. the default value is 12h. fixed: https://issues.redhat.com/browse/ACM-9125

[clyang82]

/test test-unit

[clyang82]

/test test-unit

[clyang82]

/test sonarcloud

[clyang82]

/retest

[sonarcloud]

Quality Gate failed

Failed conditions

64.3% Coverage on New Code (required ≥ 70%)

See analysis details on SonarCloud

[clyang82]

/override "ci/prow/sonarcloud"

[openshift-ci]

@clyang82: /override requires failed status contexts to operate on, but none was given

In response to this:

/override

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[clyang82]

/override "ci/prow/sonarcloud"

[openshift-ci]

@clyang82: Overrode contexts on behalf of clyang82: ci/prow/sonarcloud

In response to this:

/override "ci/prow/sonarcloud"

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[yanmxa]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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[clyang82]

/override "SonarCloud Code Analysis"

[openshift-ci]

@clyang82: Overrode contexts on behalf of clyang82: SonarCloud Code Analysis

In response to this:

/override "SonarCloud Code Analysis"

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.