Cache submission annotated? as boolean

[jorg-vr]

This pull request caches annotated? for every submission in the database. The goal is to avoid a lot of queries that check if a submission is annotated.

This query was third in our server time usage:

The cause was the check if a submission has annotations on every page were submissions are listed. (And for example on the activity page, this is loaded every time a user submits)

I also updated the released scope to also include left_joins(:evaluations) as this was a mandatory addition to get this scope working and thus always included when this scope was used.

I also used the new boolean to check whether annotations should be fetched on submission show.

I left the migration query in this time as it took only 52002.3ms on Naos and the impact is larger then in #4378 because we also use it to determine if annotations should be fetched.

• Tests were added

replaces #4378

[bmesuere]

Looks good! I'm not sure about the migration query because a huge where clause with id's will be generated. I would iterate in batches over the annotations and update per batch. But if it works on naos, it will probably be fine.

[jorg-vr]

Tested on naos. It does not generate a where clause with the ids. Rails is smart enough to generate a subquery, so everything happens in sql.