sec: deprecate some webPreference defaults to be secure-by-default (#14284)

* feat: deprecate default value of nodeIntegration

* Use DeprecationStatus::Stable as the default instead of shadowing

* change wording of deprecations

* chore: also deprecate kWebviewTag and kContextIsolation

* chore: do as we preach, lets be secure-by-default in the default app

lib/browser/api/web-contents.js

@@ -293,6 +293,10 @@ WebContents.prototype._init = function () {
     ipcMain.emit(channel, event, ...args)
   })
 
+  this.on('-deprecated-default', function (event, key, oldDefault, newDefault) {
+    deprecate.warnDefault(key, oldDefault, newDefault)
+  })
+
   // Handle context menu action request from pepper plugin.
   this.on('pepper-context-menu', function (event, params, callback) {
     // Access Menu via electron.Menu to prevent circular require.