chore(frontend): remove custom Webpack sqlite-wasm integration plugins and cleanup config

- Deleted `dummy.js` and its usage for sqlite-wasm integration as custom Webpack adjustments are no longer necessary.
- Removed outdated Webpack configuration files: `ignore-sqlite-wasm.js`, `ignore-sqlite-wasm-critical-dependency.js`, and `sqljs-fix.js`.
- Introduced `sqlite-config.js` for simplified and streamlined sqlite-wasm and Skiko Webpack configuration.
- Minor code formatting adjustments across frontend modules for improved consistency.

frontend/shells/meldestelle-portal/webpack.config.d/opfs-headers.js

@@ -3,6 +3,6 @@
 config.devServer = config.devServer || {};
 config.devServer.headers = {
   ...config.devServer.headers,
-    "Cross-Origin-Opener-Policy": "same-origin",
-    "Cross-Origin-Embedder-Policy": "require-corp"
+  "Cross-Origin-Opener-Policy": "same-origin",
+  "Cross-Origin-Embedder-Policy": "require-corp"
 };