* Limit feeds import fanout to users with feeds
This filtering for feed settings occurs in
Feeds::Import#filter_users_from already, so the enqueued ForUser
jobs were mostly no-op, but the queue latency spiked as hundreds of
thousands of jobs were added to default.
Prescreen users to avoid enqueuing a noop job every hour for every single
user without a feed.
* Update tests to check only jobs for users with feeds are enqueued
* spec cleanup
Only include alice when we check no job is enqueued for her.
Assert no job is enqueued for alice.
Rename bob to user when alice isnt there to contrast.
* Update spec
Use update_columns to bypass setting validation (checking feed is
valid/reachable)
Remove unneeded timecop block when passing a set time
Remove sidekiq: fake and allow Import.call to be received
* Empty commit to trigger CI rebuild
cc7c342bb5