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

---------

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

server/public/model/post_test.go

@@ -115,29 +115,34 @@ func TestPostSanitizeProps(t *testing.T) {
 	post1.SanitizeProps()
 
 	require.Nil(t, post1.GetProp(PropsAddChannelMember))
+	require.Nil(t, post1.GetProp(PostPropsForceNotification))
 
 	post2 := &Post{
 		Message: "test",
 		Props: StringInterface{
-			PropsAddChannelMember: "test",
+			PropsAddChannelMember:      "test",
+			PostPropsForceNotification: "test",
 		},
 	}
 
 	post2.SanitizeProps()
 
 	require.Nil(t, post2.GetProp(PropsAddChannelMember))
+	require.Nil(t, post2.GetProp(PostPropsForceNotification))
 
 	post3 := &Post{
 		Message: "test",
 		Props: StringInterface{
-			PropsAddChannelMember: "no good",
-			"attachments":         "good",
+			PropsAddChannelMember:      "no good",
+			PostPropsForceNotification: "no good",
+			"attachments":              "good",
 		},
 	}
 
 	post3.SanitizeProps()
 
 	require.Nil(t, post3.GetProp(PropsAddChannelMember))
+	require.Nil(t, post3.GetProp(PostPropsForceNotification))
 
 	require.NotNil(t, post3.GetProp("attachments"))
 }