packages,plugins: use backend:build for all backend packages + publish config and no tsconfig

packages/backend/package.json

@@ -1,7 +1,7 @@
 {
   "name": "example-backend",
   "version": "0.1.1-alpha.8",
-  "main": "dist",
+  "main": "dist/index.cjs.js",
   "types": "src/index.ts",
   "private": true,
   "license": "Apache-2.0",
@@ -9,7 +9,7 @@
     "node": ">=12"
   },
   "scripts": {
-    "build": "tsc",
+    "build": "backstage-cli backend:build",
     "start": "backstage-cli backend:dev",
     "lint": "backstage-cli lint",
     "test": "backstage-cli test",
@@ -24,7 +24,6 @@
     "@backstage/plugin-identity-backend": "^0.1.1-alpha.8",
     "@backstage/plugin-scaffolder-backend": "^0.1.1-alpha.8",
     "@backstage/plugin-sentry-backend": "^0.1.1-alpha.8",
-    "esm": "^3.2.25",
     "express": "^4.17.1",
     "knex": "^0.21.1",
     "sqlite3": "^4.2.0",
@@ -34,15 +33,6 @@
     "@backstage/cli": "^0.1.1-alpha.8",
     "@types/express": "^4.17.6",
     "@types/express-serve-static-core": "^4.17.5",
-    "@types/helmet": "^0.0.47",
-    "jest": "^26.0.1",
-    "tsc-watch": "^4.2.3",
-    "typescript": "^3.9.2"
-  },
-  "nodemonConfig": {
-    "watch": [
-      "./dist",
-      "node_modules/@backstage*"
-    ]
+    "@types/helmet": "^0.0.47"
   }
 }

packages/backend/tsconfig.json

@@ -1,15 +0,0 @@
-{
-  "include": ["src"],
-  "compilerOptions": {
-    "outDir": "dist",
-    "incremental": true,
-    "sourceMap": true,
-    "declaration": true,
-    "strict": true,
-    "target": "es2019",
-    "module": "commonjs",
-    "esModuleInterop": true,
-    "lib": ["es2019", "dom"],
-    "types": ["node", "jest", "webpack-env"]
-  }
-}