minion configuration don't have any prefix

To configure minion storage we need to provide `storage.factory.*` (see [startup](https://github.com/apache/incubator-pinot/blob/4183ffe71c19944312a99555392033cbd7481ac4/pinot-minion/src/main/java/org/apache/pinot/minion/MinionStarter.java#L164)).

But those configuration keys doesn't have the `pinot.minion` prefix like for others services (e.g. `pinot.controller.*`):
https://github.com/apache/incubator-pinot/blob/2d0d2aca7157ab23421f14f439e7792900507dd9/pinot-common/src/main/java/org/apache/pinot/common/utils/CommonConstants.java#L356

Start with the storage configuration use in pinot-minion/src/main/java/org/apache/pinot/minion/MinionStarter.java around the linked startup reference, then compare its keys with the service prefixes in pinot-common/src/main/java/org/apache/pinot/common/utils/CommonConstants.java around line 356. Confirm the intended naming convention and update the minion storage keys so the documented configuration uses the pinot.minion prefix consistently.

Written by the indexing model from the issue text.