We use a leading dash for certain things like the WebIDE, which
had the side effect of losing the `params[:continue][:to]` param when
opening the WebIDE on a project where the user doesn't have push access
and therefore needs to fork the project first.

Adds frozen string to the following:

* spec/bin/**/*.rb
* spec/config/**/*.rb
* spec/controllers/**/*.rb

xref https://gitlab.com/gitlab-org/gitlab-ce/issues/59758

Updates specs to use new rails5 format.

The old format:
`get :show, { some: params }, { some: headers }`

The new format:
`get :show, params: { some: params }, headers: { some: headers }`

Remove newlines between context and it in addition to testing redirection for create action to import path

Add a unit test for redirecting to sign-in page when user is not logged in and user visits the new fork page

* Also refactor query to get projects accessible for current user.
  ProjectsFinder actually return public projects when no user is passed.