cli: switch to using tsx and module loader register API

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/cli/package.json

@@ -40,8 +40,6 @@
     "@backstage/integration": "workspace:^",
     "@backstage/release-manifests": "workspace:^",
     "@backstage/types": "workspace:^",
-    "@esbuild-kit/cjs-loader": "^2.4.1",
-    "@esbuild-kit/esm-loader": "^2.5.5",
     "@manypkg/get-packages": "^1.1.3",
     "@octokit/graphql": "^5.0.0",
     "@octokit/graphql-schema": "^13.7.0",
@@ -131,6 +129,7 @@
     "swc-loader": "^0.2.3",
     "tar": "^6.1.12",
     "terser-webpack-plugin": "^5.1.3",
+    "tsx": "^3.14.0",
     "util": "^0.12.3",
     "webpack": "^5.70.0",
     "webpack-dev-server": "^4.7.3",