We want to blacklist only known, consistent failures. We should deflake tests rather than ignoring them.

It seems most of these blacklisted tests do actually pass most of the time.

I'm of the opinion that having them blacklisted here means there is very little incentive for us to deflake any flaky tests, and meanwhile any value in those tests is completely lost.

This commit was originally merged in #7228 but reverted in #7254 as the
associated sytest was not ready yet. Now that it is, we can merge this
again.

This reverts commit 59f0ca8b.

Remove tests that got blacklisted while torturing was enabled, and add one that
fails.

This also adds a worker blacklist.