internal/cmd: add build info metric in helm/ansible operators

[joelanford]

Description of the change:
Added the ansible_operator_build_info and helm_operator_build_info metrics to instrument commit and version information for the Ansible and Helm operators, respectively.

Motivation for the change:

Expose runtime version information to augment stamp versions in bundle and CSV metadata.

Checklist

If the pull request includes user-facing changes, extra documentation is required:

• Add a new changelog fragment in changelog/fragments (see changelog/fragments/00-template.yaml)
• Add or update relevant sections of the docs website in website/content/en/docs

[estroz]

I do have a slight concern about including the git commit as a metric, but I expect most operators to be using a released version of <ansible|helm>-operator so this value will likely not explode in-cluster.

/lgtm

[camilamacedo86]

/lgtm

[camilamacedo86]

@joelanford just a nit. Could you please add a comment here in this method before we get it merged?

Suggested change

	func RegisterBuildInfo(r prometheus.Registerer) {
	// RegisterBuildInfo ...
	func RegisterBuildInfo(r prometheus.Registerer) {

[joelanford]

I'm going to go ahead and merge without these comments since CI already passed. If I push to this branch again, this PR will get stuck (we're currently out of Travis CI build credits).

[joelanford]

@estroz I think the git commit hash is okay. Prometheus itself does this: https://www.robustperception.io/exposing-the-software-version-to-prometheus