Signed-off-by: Alan Guo <aguo@anyscale.com>
## Why are these changes needed?
Reduces memory footprint of the dashboard.
Also adds some cleanup to the errors data.
Also cleans up actor cache by removing dead actors from the cache.
Dashboard UI no longer allows you to see logs for all workers in a node. You must click into each worker's logs individually.
<img width="1739" alt="Screen Shot 2022-07-20 at 9 13 00 PM" src="https://user-images.githubusercontent.com/711935/180128633-1633c187-39c9-493e-b694-009fbb27f73b.png">
## Related issue number
fixes#23680fixes#22027fixes#24272
Currently `wait_until_succeeded_without_exception` is used in the dashboard, and it returns True/False. Unfortunately, there are lots of code that doesn't assert on this method (which means things are not actually tested).
