## What changed and why?
Ephemeral data was meant to be separate per task queue type (instead of
for all types together like task queue user data), but the
implementation didn't match that exactly: activity/other queues did
propagate ephemeral data from the workflow queue. This fixes that to not
pass ephemeral data along that edge.
Also reduce the `returning user data` log to debug level.
## How did you test it?
- [ ] built
- [x] run locally and tested manually
- [ ] covered by existing tests
- [x] added new unit test(s)
- [ ] added new functional test(s)
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