CE port of "Comment will select all activites filter by default"

See merge request gitlab-org/gitlab-ce!29496

Use `retry_on_exception` instead of duplicating code

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