Enhance policy validation to consider scan result

policy as its rule can have no branches. It also
clears up a misunderstanding in a comment.

EE: true

ee/app/assets/javascripts/threat_monitoring/components/policy_editor/utils.js

@@ -71,7 +71,7 @@ const updatePolicy = async ({
 };
 
 /**
- * Updates the assigned security policy project's policy file with the new policy yaml or creates one (project or file) if one does not exist
+ * Updates the assigned security policy project's policy file with the new policy yaml or creates one file if one does not exist
  * @param {Object} payload contains the currently assigned security policy project (if one exists), the path to the project, and the policy yaml value
  * @returns {Object} contains the currently assigned security policy project and the created merge request
  */

ee/app/services/security/security_orchestration_policies/validate_policy_service.rb

@@ -22,10 +22,12 @@ module Security
       def invalid_policy_type?
         return true if policy[:type].blank?
 
-        !Security::OrchestrationPolicyConfiguration::AVAILABLE_POLICY_TYPES.include?(policy[:type].to_sym)
+        !Security::OrchestrationPolicyConfiguration::AVAILABLE_POLICY_TYPES.include?(policy_type)
       end
 
       def blank_branch_for_rule?
+        return false if policy_type == :scan_result_policy
+
         policy[:rules].any? { |rule| rule[:clusters].blank? && rule[:branches].blank? }
       end
 
@@ -55,6 +57,10 @@ module Security
           repository.branch_names
         end
       end
+
+      def policy_type
+        policy[:type].to_sym
+      end
     end
   end
 end

ee/spec/services/security/security_orchestration_policies/validate_policy_service_spec.rb

@@ -76,12 +76,21 @@ RSpec.describe Security::SecurityOrchestrationPolicies::ValidatePolicyService do
         end
 
         context 'when branches are missing' do
+          using RSpec::Parameterized::TableSyntax
+
           let(:branches) { nil }
 
-          it { expect(result[:status]).to eq(:error) }
-          it { expect(result[:message]).to eq('Policy cannot be enabled without branch information') }
+          where(:policy_type, :status, :message) do
+            'scan_result_policy'    | :success | nil
+            'scan_execution_policy' | :error   | 'Policy cannot be enabled without branch information'
+          end
 
-          it_behaves_like 'checks only if policy is enabled'
+          with_them do
+            it { expect(result[:status]).to eq(status) }
+            it { expect(result[:message]).to eq(message) }
+
+            it_behaves_like 'checks only if policy is enabled'
+          end
         end
 
         context 'when branches are provided' do