[PM-3756] Disable node integration and enable context isolation in desktop (#6975)

* Disable node integration and enable context isolation

* Review comments

* Log in renderer through IPC

* Missed imports

* Mock electron API

* resourcesPath is undefined in the preload, but process.windowsStore works correctly

* Replace fromBufferToUtf8 conditional implementation for the `buffer` package

The current non-node implementation is different than the node implementation,
as the non-node would break when the contents can't be parsed as a URI component.
Replacing the impl by the `buffer` package makes the result match in both environments.

* Fix lint

* Add some more tests

* Remove buffer from devDependencies

apps/desktop/src/main/window.main.ts

@@ -160,11 +160,11 @@ export class WindowMain {
       backgroundColor: await this.getBackgroundColor(),
       alwaysOnTop: this.enableAlwaysOnTop,
       webPreferences: {
-        // preload: path.join(__dirname, "preload.js"),
+        preload: path.join(__dirname, "preload.js"),
         spellcheck: false,
-        nodeIntegration: true,
+        nodeIntegration: false,
         backgroundThrottling: false,
-        contextIsolation: false,
+        contextIsolation: true,
         session: this.session,
       },
     });