Remove the `ForkedProjectLink` model

This removes the `ForkedProjectLink` model that has been replaced by
the `ForkNetworkMember` and `ForkNetwork` combination. All existing
relations have been adjusted to use these new models.

The `forked_project_link` table has been dropped.

The "Forks" count on the admin dashboard has been updated to count all
`ForkNetworkMember` rows and deduct the number of `ForkNetwork`
rows. This is because now the "root-project" of a fork network also
has a `ForkNetworkMember` row. This count could become inaccurate when
the root of a fork network is deleted.

1 files changed, 7 insertions, 5 deletions

diff --git a/spec/helpers/visibility_level_helper_spec.rb b/spec/helpers/visibility_level_helper_spec.rb
index a3be222b7bd..e565ac8c530 100644
--- a/spec/helpers/visibility_level_helper_spec.rb
+++ b/spec/helpers/visibility_level_helper_spec.rb
@@ -1,6 +1,8 @@
 require 'spec_helper'
 
 describe VisibilityLevelHelper do
+  include ProjectForksHelper
+
   let(:project)          { build(:project) }
   let(:group)            { build(:group) }
   let(:personal_snippet) { build(:personal_snippet) }
@@ -83,13 +85,13 @@ describe VisibilityLevelHelper do
 
   describe "disallowed_visibility_level?" do
     describe "forks" do
-      let(:project)       { create(:project, :internal) }
-      let(:fork_project)  { create(:project, forked_from_project: project) }
+      let(:project) { create(:project, :internal) }
+      let(:forked_project) { fork_project(project) }
 
       it "disallows levels" do
-        expect(disallowed_visibility_level?(fork_project, Gitlab::VisibilityLevel::PUBLIC)).to be_truthy
-        expect(disallowed_visibility_level?(fork_project, Gitlab::VisibilityLevel::INTERNAL)).to be_falsey
-        expect(disallowed_visibility_level?(fork_project, Gitlab::VisibilityLevel::PRIVATE)).to be_falsey
+        expect(disallowed_visibility_level?(forked_project, Gitlab::VisibilityLevel::PUBLIC)).to be_truthy
+        expect(disallowed_visibility_level?(forked_project, Gitlab::VisibilityLevel::INTERNAL)).to be_falsey
+        expect(disallowed_visibility_level?(forked_project, Gitlab::VisibilityLevel::PRIVATE)).to be_falsey
       end
     end