HUH-74: Revert Verify sign-in hint on interstitial page

This reverts the work done in [PR #1585](#1585)
and [PR #1588](#1588)
to implement the test for including a sign-in hint on the Verify
interstitial page.

The following commits have been reverted and squashed into this one
commit:

d6b5038
8ef65d2
9f132b7
8665524
c3bd6e9

.rubocop.yml

@@ -11,8 +11,3 @@ Rails/OutputSafety:
   Enabled: false
 Rails/HelperInstanceVariable:
   Enabled: false
-
-# Temporary - should be reverted as soon as the Verify tests finishes
-AllCops:
-  Exclude:
-    - "config/initializers/csp.rb"

app/assets/stylesheets/application.scss

@@ -47,6 +47,5 @@ $govuk-use-legacy-palette: false;
 @import 'views/answer';
 @import 'views/help-page';
 @import "views/guide";
-@import 'views/choose_sign_in';
 
 

app/views/content_items/service_sign_in/_choose_sign_in.html.erb

@@ -27,7 +27,6 @@
   <%= render "govuk_publishing_components/components/fieldset", legend_text: legend_text do %>
     <div class="govuk-grid-row">
       <div class="govuk-grid-column-two-thirds">
-      <div data-module="show-gov-uk-verify-hint"></div>
         <%= render 'govuk_publishing_components/components/govspeak', content: raw(@content_item.description) %>
         <% if @error %>
           <%= render "components/error-message", text: t('service_sign_in.error.option') %>

config/initializers/csp.rb

@@ -1,76 +1 @@
-# GovukContentSecurityPolicy.configure
-# THIS A TEMPORARY COPY OF THE POLICY FROM THE GEM ABOVE
-# FOR THE TEMPORARY TEST WE NEED TO ADD A NEW DOMAIN FOR IMAGES (LINE 30)
-# WILL BE REVERTED BACK TO THE GEM ONCE THE TESTS FINISHES
-
-GOVUK_DOMAINS = [
-    '*.publishing.service.gov.uk',
-    "*.#{ENV['GOVUK_APP_DOMAIN_EXTERNAL'] || ENV['GOVUK_APP_DOMAIN'] || 'dev.gov.uk'}",
-    "*.dev.gov.uk"
-  ].uniq.freeze
-
-GOOGLE_ANALYTICS_DOMAINS = %w(www.google-analytics.com
-                              ssl.google-analytics.com
-                              stats.g.doubleclick.net).freeze
-
-Rails.application.config.content_security_policy_report_only = ENV.include?("GOVUK_CSP_REPORT_ONLY")
-
-Rails.application.config.content_security_policy do |policy|
-  # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/default-src
-  policy.default_src :https, :self, *GOVUK_DOMAINS
-
-  # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/img-src
-  policy.img_src :self,
-                :data, # Base64 encoded images
-                *GOVUK_DOMAINS,
-                *GOOGLE_ANALYTICS_DOMAINS, # Tracking pixels
-                # Some content still links to an old domain we used to use
-                "assets.digital.cabinet-office.gov.uk",
-                # For a Verify enhanced hint live test (temporary)
-                "gds-verify-frontend-assets.s3.amazonaws.com"
-
-  # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src
-  policy.script_src :self,
-                    *GOVUK_DOMAINS,
-                    *GOOGLE_ANALYTICS_DOMAINS,
-                    # Allow JSONP call to Verify to check whether the user is logged in
-                    "www.signin.service.gov.uk",
-                    # Allow YouTube Embeds (Govspeak turns YouTube links into embeds)
-                    "*.ytimg.com",
-                    "www.youtube.com",
-                    "www.youtube-nocookie.com",
-                    # Allow all inline scripts until we can conclusively
-                    # document all the inline scripts we use,
-                    # and there's a better way to filter out junk reports
-                    :unsafe_inline
-
-  # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/style-src
-  policy.style_src :self,
-                  *GOVUK_DOMAINS,
-                  # We use the `style=""` attribute on some HTML elements
-                  :unsafe_inline
-
-  # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/font-src
-  policy.font_src :self,
-                  *GOVUK_DOMAINS,
-                  :data # Used by some legacy fonts
-
-  # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/connect-src
-  policy.connect_src :self,
-                    *GOVUK_DOMAINS,
-                    *GOOGLE_ANALYTICS_DOMAINS,
-                    # Allow connecting to web chat from HMRC contact pages
-                    "www.tax.service.gov.uk",
-                    # Allow connecting to Verify to check whether the user is logged in
-                    "www.signin.service.gov.uk"
-
-  # Disallow all <object>, <embed>, and <applet> elements
-  #
-  # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/object-src
-  policy.object_src :none
-
-  # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/frame-src
-  policy.frame_src :self, *GOVUK_DOMAINS, "www.youtube.com", "www.youtube-nocookie.com" # Allow youtube embeds
-
-  policy.report_uri ENV["GOVUK_CSP_REPORT_URI"] if ENV.include?("GOVUK_CSP_REPORT_URI")
-end
+GovukContentSecurityPolicy.configure