Improved ESLint configuration, integrated spellcheck and error fixes (#8931)

* integrate cspell with eslint, improved configuration

* core: fix linting errors

* core: fix lint warnings

* content: lint fixes

* process service lint fixes

* lint: process services cloud

* lint: insights

* lint: extensions

* [ci:force] lint: cli fixes

* [ci:force] comment out dead code

* [ci:force] exclude dead code

* fix code and tests

* rollback some changes

* fix testing lib

* fix demo shell

* minor lint warning fixes

* minor lint fixes

* fix process services

cspell.json

@@ -139,7 +139,8 @@
     "webscript",
     "Whitespaces",
     "xdescribe",
-    "xsrf"
+    "xsrf",
+    "Undeployed"
   ],
   "dictionaries": [
     "html",