Streamlined eslint usage for eslint9 w/ cds8 (#719)

* Streamlined eslint usage

* import from @sap/cds instead of @sap/cds/lib

* Using @sap/cds/eslint.js

* eslint.config.mjs aktualisieren

* Adjusted eslint usage for eslint9 with cds8

package.json

@@ -21,7 +21,6 @@
     ],
     "devDependencies": {
       "@cap-js/sqlite": "^1",
-      "@sap/eslint-plugin-cds": "^3",
       "axios": "^1",
       "chai": "^4.3.4",
       "chai-as-promised": "^7.1.1",