Use package.json files array instead of .npmignore (#50408)

.npmignore

@@ -1,41 +0,0 @@
-built
-doc
-Gulpfile.js
-internal
-jenkins.sh
-lib/README.md
-lib/enu
-netci.groovy
-scripts
-src
-tests
-Jakefile.js
-.devcontainer
-.eslintrc
-.eslintignore
-.editorconfig
-.failed-tests
-.git
-.git/
-.gitattributes
-.github/
-.gitmodules
-.settings/
-.travis.yml
-.circleci
-.vscode/
-.parallelperf.json
-.mailmap
-test.config
-package-lock.json
-yarn.lock
-CONTRIBUTING.md
-TEST-results.xml
-.dockerignore
-Dockerfile
-.DS_Store
-.eslintrc.json
-.yarnrc
-tmp
-.eslintplugin.js
-.eslintcache

package.json

@@ -28,6 +28,17 @@
     "engines": {
         "node": ">=4.2.0"
     },
+    "files": [
+        "./bin",
+        "./lib",
+        "!./lib/enu",
+        "./loc",
+        "./AUTHORS.md",
+        "./LICENSE.txt",
+        "./README.md",
+        "./SECURITY.md",
+        "./ThirdPartyNoticeText.txt"
+    ],
     "devDependencies": {
         "@octokit/rest": "latest",
         "@types/async": "latest",