remove legacy security plugin (#75648)

* remove legacy security plugin

* remove legacy plugin check

* adapt mocha tests

* update CODEOWNERS

.github/CODEOWNERS

@@ -167,7 +167,6 @@
 
 # Security
 /src/core/server/csp/  @elastic/kibana-security @elastic/kibana-platform
-/x-pack/legacy/plugins/security/  @elastic/kibana-security
 /x-pack/legacy/plugins/spaces/  @elastic/kibana-security
 /x-pack/plugins/spaces/  @elastic/kibana-security
 /x-pack/plugins/encrypted_saved_objects/  @elastic/kibana-security
@@ -287,7 +286,6 @@ x-pack/plugins/telemetry_collection_xpack/schema/xpack_plugins.json @elastic/kib
 /src/plugins/dashboard/**/*.scss @elastic/kibana-core-ui-designers
 /x-pack/plugins/canvas/**/*.scss @elastic/kibana-core-ui-designers
 /src/legacy/core_plugins/kibana/public/home/**/*.scss @elastic/kibana-core-ui-designers
-/x-pack/legacy/plugins/security/**/*.scss @elastic/kibana-core-ui-designers
 /x-pack/legacy/plugins/spaces/**/*.scss @elastic/kibana-core-ui-designers
 /x-pack/plugins/spaces/**/*.scss @elastic/kibana-core-ui-designers
 /x-pack/plugins/security/**/*.scss @elastic/kibana-core-ui-designers
@@ -297,7 +295,7 @@ x-pack/plugins/telemetry_collection_xpack/schema/xpack_plugins.json @elastic/kib
 /x-pack/plugins/infra/**/*.scss @elastic/observability-design
 /x-pack/plugins/ingest_manager/**/*.scss @elastic/observability-design
 /x-pack/plugins/observability/**/*.scss @elastic/observability-design
-/x-pack/plugins/monitoring/**/*.scss @elastic/observability-design 
+/x-pack/plugins/monitoring/**/*.scss @elastic/observability-design
 
 # Ent. Search design
 /x-pack/plugins/enterprise_search/**/*.scss @elastic/ent-search-design

x-pack/index.js

@@ -5,9 +5,8 @@
  */
 
 import { xpackMain } from './legacy/plugins/xpack_main';
-import { security } from './legacy/plugins/security';
 import { spaces } from './legacy/plugins/spaces';
 
 module.exports = function (kibana) {
-  return [xpackMain(kibana), spaces(kibana), security(kibana)];
+  return [xpackMain(kibana), spaces(kibana)];
 };