Bucketing warning does not take into account feature co-enrollment or versions

[brennie]

We have the following warning:

    ERROR_BUCKET_EXISTS = "WARNING: A rollout already exists for this combination \
        of application, feature, channel, and advanced targeting! \
        If this rollout is launched, a client meeting the advanced targeting criteria \
        will be enrolled in one and not the other and \
        you will not be able to adjust the sizing for this rollout."

source

which is triggered in in the review serializer if we have two rollouts on the same application, feature, channel, advanced targeting.

However, this does not take into account feature co-enrollment (such as for the messages features on ios/android) or min/max versions into account

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