Datastore: Update Indexes for Actions

[ao-david]

To be able to use the queries which we are using for actions, we need to update the indexes. This can be seen from the error from running the tests on the cloud in ausoceantv:

--- FAIL: TestModelInCloudStore (7.28s)
    --- FAIL: TestModelInCloudStore/Action (1.08s)
        --- FAIL: TestModelInCloudStore/Action/GetActionsBySubscriber_[Limit=1] (0.08s)
            model_test.go:576: unable to get actions by subscriber: unable to get all actions for subscriber: rpc error: code = FailedPrecondition desc = no matching index found. recommended index is:
                - kind: Action
                  properties:
                  - name: SubscriberID
                  - name: Time
            model_test.go:580: expected one action, got 0
        --- FAIL: TestModelInCloudStore/Action/GetActionsByType (0.07s)
            model_test.go:590: unable to get actions by type: unable to get all actions by type: rpc error: code = FailedPrecondition desc = no matching index found. recommended index is:
                - kind: Action
                  properties:
                  - name: Type
                  - name: Time
            model_test.go:594: expected two actions, got 0
FAIL
exit status 1