Problem Statement/Rationale

This is a follow up on COMPASS-7519.

In the task above, we've made sure the userId is not referring to the legacy anonymous userId, but to the atlas user id. However, we still make `identify` calls to segment that have no userId (meaning the user hasn't signed in with Atlas).

What's preventing us from removing these calls is that we'd loose the `traits` (e.g. compass version, platform..). These are part of `identify` calls, but not `track` - see segment docs. This task is to finally remove the anonymous `identify` calls, while ensuring that we do still have traits data for anonymous users.

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Actual Results

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