Add test notification tool (#28334)

* Add test notification tool

* Add frontend styles

* Remove option from admin view

* Refactor create post and add translations

* Fix several CI errors

* Fix API and frontend snapshots

* Refactor trailing and leading icon on buttons

* Add different button states

* i18n-extract

* Fix wrong text

* Add tests

* Fix wrong string

* Fix test

* feat: E2E send test notifications (#28371)

* Refactor send desktop notification

* Address rest of the feedback

* Fix tests

* Add correct link

* Fix test

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Co-authored-by: Mattermost Build <build@mattermost.com>
Co-authored-by: yasserfaraazkhan <attitude3cena.yf@gmail.com>

e2e-tests/cypress/tests/support/index.js

@@ -28,6 +28,7 @@ import './fetch_commands';
 import './keycloak_commands';
 import './ldap_commands';
 import './ldap_server_commands';
+import './notification_commands';
 import './okta_commands';
 import './saml_commands';
 import './shell';