Move playbooks to plugin (#23732)

* Remove build references

* Remove playbooks webapp and server, and add the prepackaged plugin

* Remove translations

* Add ProductSettings to the playwright type

* Restore playbooks as a prepackaged plugin for cypress e2e tests

e2e-tests/cypress/tests/support/api/plugin.js

@@ -148,6 +148,7 @@ const prepackagedPlugins = [
     'com.mattermost.nps',
     'com.mattermost.welcomebot',
     'zoom',
+    'playbooks',
 ];
 
 Cypress.Commands.add('apiDisableNonPrepackagedPlugins', () => {

e2e-tests/playwright/support/server/default_config.ts

@@ -606,9 +606,7 @@ const defaultServerConfig: AdminConfig = {
         CleanupJobsThresholdDays: -1,
         CleanupConfigThresholdDays: -1,
     },
-    ProductSettings: {
-        EnablePlaybooks: true,
-    },
+    ProductSettings: {},
     PluginSettings: {
         Enable: true,
         EnableUploads: false,