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

nx.json

@@ -35,7 +35,6 @@
     },
     "lint": {
       "dependsOn": [
-            "spellcheck",
             "stylelint"
       ]
     }
@@ -44,7 +43,7 @@
     "default": {
       "runner": "nx/tasks-runners/default",
       "options": {
-        "cacheableOperations": ["build", "lint", "test", "spellcheck", "stylelint"],
+        "cacheableOperations": ["build", "lint", "test", "stylelint"],
         "cacheDirectory": "nxcache",
         "runtimeCacheInputs": ["node -v"]
       }