Add usage collection report

[yorugac]

Feature Description

To improve decision-making, add installation collection, similar to what was done for k6-studio:
https://grafana.com/docs/k6-studio/set-up/usage-collection/

Suggested Solution (optional)

The endpoint for usage reports is simple and can be easily sent on the start of the k6-operator. But there are open questions:

1. Currently k6-operator version is not exposed in the code - that will need to be changed here.
2. OS and arch make no sense for k6-operator. Confirm if there's anything else that makes sense to use instead, like getting Kubernetes version.
3. k6-studio relies on "installation ID" written to the file system:
   https://github.com/grafana/k6-studio/blob/14f94da52ba84f0847df66a30005c1244032f680/src/usageReport.ts#L12
   This cannot be used by k6-operator without volumes which is an overkill here. But without persistence, it'd be impossible to distinguish between installation and restart of the app. emptyDir volume can handle restart in-place but not the pod's rescheduling 😕

Opt-out should probably be done the same as in k6 and k6-studio, with a CLI argument.

Already existing or connected issues / PRs (optional)

No response

[yorugac]

Pre-install hook for Helm chart might be of use here too:
https://helm.sh/docs/topics/charts_hooks/

But it'd be a pretty separate flow from the main app.