Add Orgs sharding for Blunderbuss

[dhaiducek]

Using a pointer lets sharding determine whether a config had been provided so they can be properly compared. If one is not provided, this also instantiates one in setDefaults(), which is called following the sharding logic.

Migrated from:

• Fix sharding by using a pointer for global Blunderbuss config kubernetes/test-infra#29405

[k8s-ci-robot]

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[k8s-ci-robot]

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[jmguzik]

/ok-to-test

[petr-muller]

/cc