Enhance Helm chart labels by using helper scripts and standard keys

[Boojapho]

In the Helm chart, labels are hard to maintain because they are repeated everywhere and do not use helm best practices. This enhancement would do the following:

1. Create a helper script for "common" labels that includes app, heritage, chart, release and gatekeeper.sh/system that go on every resource
2. Rename app to app.kubernetes.io/name
3. Rename chart to helm.sh/chart
4. Rename release to app.kubernetes.io/instance
5. Rename heritage to app.kubernetes.io/managed-by
6. Rename gatekeeper.sh/system: "yes" to `app.kubernetes.io/part-of: "gatekeeper/system"
7. Rename gatekeeper.sh/operation to app.kubernetes.io/component

The gatekeeper.sh/operation label is not a common resource and would need updating on every resource that uses it.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 14 days if no further activity occurs. Thank you for your contributions.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 14 days if no further activity occurs. Thank you for your contributions.