[stable/minecraft] Update to the recommended pvc patterns.

[AmandaCameron]

This is a split-off of PR #408 to just contain the chart minecraft.
If there's any commonality in changes nessary between this PR and the others that are being submitted at once, please mention them in #408.
Some things to note:

• This initial PR will not be updating the Chart.yaml's version string, as I feel it should be done manually per-pr once each chart's otherwise acceptable.
• An automated script created the splits and the PRs, on a per-folder basis under stable, after copying the relevent files from a backup of my local copy of Update all stable PVCs to use recommended pattern. #408

[k8s-ci-robot]

Hi @AmandaCameron. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with @k8s-bot ok to test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[viglesiasce]

@k8s-bot ok to test