Use an Entry obj instead of Struct

ee/lib/ee/gitlab/background_migration/migrate_approver_to_approval_rules.rb

@@ -130,7 +130,7 @@ module EE
                   rule = approval_rules.code_owner.first
                   rule ||= ApprovalMergeRequestRule.find_or_create_code_owner_rule(
                     self,
-                    Struct.new(:pattern, :owner_line).new("Code Owner")
+                    ::Gitlab::CodeOwners::Entry.new("Code Owner", owners)
                   )
 
                   rule.users = owners.uniq

ee/spec/models/approval_merge_request_rule_spec.rb

@@ -156,17 +156,16 @@ describe ApprovalMergeRequestRule do
 
   describe '.find_or_create_code_owner_rule' do
     let!(:existing_code_owner_rule) { create(:code_owner_rule, name: '*.rb', merge_request: merge_request) }
-    let(:entry) { Struct.new(:pattern, :owner_line).new }
 
     it 'finds an existing rule' do
-      entry.pattern = "*.rb"
+      entry = Gitlab::CodeOwners::Entry.new("*.rb", "@user")
 
       expect(described_class.find_or_create_code_owner_rule(merge_request, entry))
         .to eq(existing_code_owner_rule)
     end
 
     it 'creates a new rule if it does not exist' do
-      entry.pattern = "*.js"
+      entry = Gitlab::CodeOwners::Entry.new("*.js", "@user")
 
       expect { described_class.find_or_create_code_owner_rule(merge_request, entry) }
         .to change { merge_request.approval_rules.matching_pattern('*.js').count }.by(1)
@@ -176,7 +175,7 @@ describe ApprovalMergeRequestRule do
       deprecated_code_owner_rule = create(:code_owner_rule, name: '*.md', merge_request: merge_request)
       deprecated_code_owner_rule.update_column(:rule_type, described_class.rule_types[:regular])
 
-      entry.pattern = "*.md"
+      entry = Gitlab::CodeOwners::Entry.new("*.md", "@user")
 
       expect(described_class.find_or_create_code_owner_rule(merge_request, entry))
         .to eq(deprecated_code_owner_rule)
@@ -186,7 +185,7 @@ describe ApprovalMergeRequestRule do
       expect(described_class).to receive(:code_owner).and_raise(ActiveRecord::RecordNotUnique)
       allow(described_class).to receive(:code_owner).and_call_original
 
-      entry.pattern = "*.js"
+      entry = Gitlab::CodeOwners::Entry.new("*.js", "@user")
 
       expect(described_class.find_or_create_code_owner_rule(merge_request, entry)).not_to be_nil
     end