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

lib/core/shell/src/lib/components/shell/shell.component.spec.ts

@@ -52,8 +52,8 @@ describe('AppLayoutComponent', () => {
       hideSidenavConditions: [],
       minimizeSidenavConditions: [],
       preferencesService: {
-        get: (_key: string) => 'true',
-        set: (_key: string, _value: any) => {}
+        get: () => 'true',
+        set: () => {}
       }
     };