test: tsify more web contents specs (#19969)

* test: tsify more WebContents specs

* getFocusedWebContents

* setDevToolsWebContents, isFocused, isCurrentlyAudible

* getWebPreferences, openDevTools

* before-input-event

* zoom-changed

* sendInputEvent

* insertCSS

* startDrag

* focus, getOSProcessId

* zoom api

* more closeAllWindows

* fix detached dev tools test

* fix zoom-changed test

* compare the correct kind of id 🤦‍♂️

* 'fix' openDevTools test to wait for multiple focus events

* fix tests? 🤞

* use request instead of blur to detect openExternal success

* try not timing out the keychain for testing

* use blur event on mac, sigh

* oh, right, still gotta open an actual url

docs/api/web-contents.md

@@ -1593,8 +1593,8 @@ End subscribing for frame presentation events.
 
 * `item` Object
   * `file` String[] | String - The path(s) to the file(s) being dragged.
-  * `icon` [NativeImage](native-image.md) - The image must be non-empty on
-    macOS.
+  * `icon` [NativeImage](native-image.md) | String - The image must be
+    non-empty on macOS.
 
 Sets the `item` as dragging item for current drag-drop operation, `file` is the
 absolute path of the file to be dragged, and `icon` is the image showing under