This PR adds automated testing for electron app binaries

To be sure that the release build of the Electron app has been successful adds ability to auto-validate that the application works fine on all OSs (Linux, Mac, Win):

• https://www.electronjs.org/docs/latest/tutorial/automated-testing
• https://webdriver.io/docs/desktop-testing/electron
• https://webdriver.io/docs/wdio-electron-service
• https://github.com/webdriverio/webdriverio

The flow:

• build release on GitHub Actions
• use unpacked builds for E2E tests
• launch E2E test on Linux, Mac, Win OSs independently
• provide E2E test reports for every OS launch

Basic changes:

• adds simple E2E using WebdriverIO for verifying binaries
• prevents removal app unpacked folder for E2E test runner
• reworks electron-builder config to be able to launch E2E tests
• adds E2E test runner to GitHub actions
• add E2E test report workflow
• skips redundant files in build
• bumps Electron up to 27.0.4
• bump electron-builder up to 24.8.1 to have executable name fix
• bumps actions/checkout up to v4
• adds cross-env for dev/test scripts
• adds local GitHub Action to turn uninterrupted E2E testing on macOS Mac image starts with open system dialogs actions/runner-images#978 (comment)
• uses macos-12 in GitHub Actions
• disables enforce macos app location for E2E test runner

Examples of E2E test runners and reports:

• Build and E2E Test Run
• E2E Test Report Run
• Linux report
• Mac report
• Win report