Add constraint to id param for ThreatMonitoringController

This change fixes the bug while trying to edit Cilium policies.
The reason for the bug was that rails does not accept dots
in routes by default for id params.
Changelog: fixed
EE: true

ee/config/routes/project.rb

@@ -41,7 +41,7 @@ constraints(::Constraints::ProjectUrlConstrainer.new) do
 
         resource :threat_monitoring, only: [:show], controller: :threat_monitoring do
           get '/alerts/:iid', action: 'alert_details', constraints: { iid: /\d+/ }, as: :threat_monitoring_alert
-          resources :policies, only: [:new, :edit], controller: :threat_monitoring
+          resources :policies, only: [:new, :edit], controller: :threat_monitoring, constraints: { id: %r{[^/]+} }
         end
 
         resources :protected_environments, only: [:create, :update, :destroy], constraints: { id: /\d+/ } do

ee/spec/routing/project_routing_spec.rb

@@ -70,4 +70,16 @@ RSpec.describe 'EE-specific project routing' do
       expect(get('/gitlab/gitlabhq/-/security/policy')).to route_to('projects/security/policies#show', namespace_id: 'gitlab', project_id: 'gitlabhq')
     end
   end
+
+  describe Projects::ThreatMonitoringController, 'routing' do
+    where(:id) do
+      %w[test.1.2 test-policy test:policy]
+    end
+
+    with_them do
+      it "to #edit" do
+        expect(get("/gitlab/gitlabhq/-/threat_monitoring/policies/#{id}/edit")).to route_to('projects/threat_monitoring#edit', namespace_id: 'gitlab', project_id: 'gitlabhq', id: id)
+      end
+    end
+  end
 end