MM-53989 Upgrade to Node 18 and NPM 9 (#24283)

* MM-53989 Update to Node 18 and NPM 9

* MM-53989 Remove skip_integrity_check.js

* Force e2e-test/cypress to use its version of TS for types package

* Update .nvmrc

* Update .nvmrc lineending

* Update server.override.yml

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Co-authored-by: M-ZubairAhmed <m-zubairahmed@protonmail.com>
Co-authored-by: Mattermost Build <build@mattermost.com>

webapp/package.json

@@ -2,11 +2,11 @@
   "name": "@mattermost/webapp",
   "private": true,
   "engines": {
-    "node": "^16.10.0",
-    "npm": "^7.24.0"
+    "node": "^18.10.0",
+    "npm": "^9.0.0"
   },
   "scripts": {
-    "postinstall": "node scripts/skip_integrity_check.js && npm run build --workspace=platform/types --workspace=platform/client --workspace=platform/components",
+    "postinstall": "npm run build --workspace=platform/types --workspace=platform/client --workspace=platform/components",
     "build": "node scripts/build.js",
     "run": "node scripts/run.js",
     "dev-server": "node scripts/dev-server.js",