All the changes done to files that are also inside CE and need to be
ported.

Many elements defined in the QA framework in ci_variable.rb
call elements and methods that are not framework specific.

Fix these issues, as well as use data-qa-selector s

CE port of "Fix spam in issue creation by making project private"

See merge request gitlab-org/gitlab-ce!30997

When used with a Hash, `.keys.include?` is bad because:

1. It performs a O(n) search instead of the efficient `.has_key?`
2. It clones all keys into separate array.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/64975

There should be no difference between jobs in package-and-qa.

Review apps should also be similar but there might be differences
if the runners have different resources.

CE port of EE branch qa-staging-61-fix-ee-project-templates-spec

See merge request gitlab-org/gitlab-ce!30835