This is to prepare for supporing image type position tracing

Allows us to correctly set omniauth's full_host
so redirects take the port into account.

Needed when running selenium tests on a different port

Limit amount of JUnit tests returned

Closes #64035

See merge request gitlab-org/gitlab-ce!30274

Currently, we do not cap amount of tests returned to frontend,
thus in some extreme cases we can see a MBs of data stored in Redis.

This adds an upper limit of 100 tests per-suite.

We will continue showing the total counters correctly,
but we will limit amount of tests that will be presented.

rename `discussion` to `thread`

Closes #55953

See merge request gitlab-org/gitlab-ce!29553

- all commits squashed to make danger review happy

If `spec/tasks/gitlab/cleanup_rake_spec.rb` preceded any of the Gitaly
request specs, it would import the `cleanup.rake` and the global
function `limit`. For some reason, the Protobuf implementation would use
the global function instead of the getter method. For example:

```
def limit
  puts "hi"
end

req = Gitaly::WikiGetAllPagesRequest.new
req.send(:limit)
hi
=> nil
```

To fix this problem, access the field value using the [] operator
instead.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/64006