Refactor build configs and improve CI/CD checks

This commit makes the build process more robust, simplifies
configurations and reduce the risk of incomplete or erroneous
deployments.

- Centralize output directory definitions by introducing
  `dist-dirs.json`.
- Add `verify-build-artifacts` utility to ensure correct build outputs
  and `print-dist-dir` to determine distribution directory.
- Add steps in CI/CD pipeline to verify build artifacts.
- Migrate Electron Builder config from YAML to CJS for capability to
  read JSON.
- Fix `release-site.yaml` failing due to pointing to wrong distribution
  directory, change it to use `print-dist-dir`.
- Improve `check-desktop-runtime-errors` to verify build artifacts for
  more reliable builds. Ensure tests fail and succeed reliably.
- Update `.gitignore` and configure ESLint to use it to define and
  ignore build artifact directories from one place, remove
  `.eslintignore` that does not add anything after this change.
- Keep `"main"` field in `package.json` as `electron-vite` depends on it
  (alex8088/electron-vite#270).
- Improve documentation

tests/checks/desktop-runtime-errors/check-desktop-runtime-errors/utils/npm.ts

@@ -60,7 +60,11 @@ export async function npmBuild(
     cwd: projectDir,
   });
   if (error) {
-    log(error, LogLevel.Warn); // Cannot disable Vue CLI errors, stderr contains false-positives.
+    die(error);
+  }
+
+  if (await isDirMissingOrEmpty(distDir)) {
+    die(`The desktop application build process did not produce the expected artifacts. The output directory "${distDir}" is empty or missing.`);
   }
 }