Visit project after push

Closes gitlab-org/quality/nightly#105

See merge request gitlab-org/gitlab-ce!29247

Use update term instead of update in the clusters managed app
implementation in order to make the implementation and UI
language more consistent.

Waits for the push to a project before visiting the page
so that the updated state is shown when the page loads

It can take longer that 60 seconds for the server to be ready to
respond. Retry the login page validation twice (i.e., 3 attempts
to validate the login page)

Wait for the new file modal to stop animating before clicking it

We now need to click the commit button 3 times:
1. To enter commit mode
2. To being staging changes
3. To submit the commit

De-quarantine e2e test for issue suggestions

Closes gitlab-org/quality/staging#53

See merge request gitlab-org/gitlab-ce!29046

Log out in after all hook

See merge request gitlab-org/gitlab-ce!28969

This goes in accordance with https://bit.ly/2Z1RdjZ

According to https://bit.ly/2JTPCcF

Now that https://gitlab.com/gitlab-org/gitlab-ce/issues/60355
is closed we can de-quarantine this test.

Add knapsack qa report and use it to run tests in parallel

Use the RSpec runner with knapsack

The way the Knapsack runner uses exec to start rspec seems
incompatible with the way we expect it to work. Plus, it requires
specifying KNAPSACK_TEST_DIR.

Instead, we use knapsacks AllocatorBuilder to select the spec
files to run, and then start rspec as normal, via
RSpec::Core::Runner.run

This also means we can incorporate tags.

Let the job run automatically

Include KNAPSACK_TEST_FILE_PATTERN in vars

Check all defined knapsack env vars before requiring knapsack