feat(updater): add GitHub releases desktop updater

Adds the GitHub Releases desktop updater with release notes, startup notification, packaging metadata, tests, and CI fixes for Electron E2E.

.github/workflows/e2e-tests.yaml

@@ -12,6 +12,7 @@ jobs:
     electron-e2e-tests:
         name: Electron E2E on ${{ matrix.os }}
         runs-on: ${{ matrix.os }}
+        timeout-minutes: 45
         env:
             IPTVNATOR_ALLOW_PRIVATE_NETWORK_URLS: '1'
             NX_SKIP_NX_CACHE: true