Dont create license_management build when not included in license

This improves CI performance since we do not create a whole new job that
just exits quickly. This is important based on
https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/4907#note_104742212

changelogs/unreleased/4907-improve-build-create-performance-for-license-management.yml

+---
+title: Dont create license_management build when not included in license
+merge_request: 21958
+author:
+type: performance

lib/gitlab/ci/templates/Auto-DevOps.gitlab-ci.yml

@@ -122,6 +122,9 @@ license_management:
     paths: [gl-license-management-report.json]
   only:
     - branches
+  only:
+    variables:
+      - $GITLAB_FEATURES =~ /\blicense_management\b/
   except:
     variables:
       - $LICENSE_MANAGEMENT_DISABLED
@@ -484,15 +487,11 @@ rollout 100%:
   }
 
   function license_management() {
-    if echo $GITLAB_FEATURES |grep license_management > /dev/null ; then
     # Extract "MAJOR.MINOR" from CI_SERVER_VERSION and generate "MAJOR-MINOR-stable"
     LICENSE_MANAGEMENT_VERSION=$(echo "$CI_SERVER_VERSION" | sed 's/^\([0-9]*\)\.\([0-9]*\).*/\1-\2-stable/')
 
     docker run --volume "$PWD:/code" \
                                     "registry.gitlab.com/gitlab-org/security-products/license-management:$LICENSE_MANAGEMENT_VERSION" analyze /code
-    else
-      echo "License management is not available in your subscription"
-    fi
   }
 
   function sast() {