Added REGISTRY_STORAGE_DELETE_ENABLED environment variable for Registry addon

[hpandeycodeit]

Fixes Issue #4044

Added REGISTRY_STORAGE_DELETE_ENABLED environment variable for Registry addon.

[k8s-ci-robot]

Hi @hpandeycodeit. Thanks for your PR.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[minikube-bot]

Can one of the admins verify this patch?

[tstromberg]

@minikube-bot OK to test

[tstromberg]

Thank you for sending out this PR!

[hpandeycodeit]

@tstromberg Thank you! :)