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

demo-shell/src/app/components/file-view/file-view.component.ts

@@ -84,7 +84,7 @@ export class FileViewComponent implements OnInit {
             if (id) {
                 this.nodeApiService.getNode(id).subscribe(
                     (node) => {
-                        if (node && node.isFile) {
+                        if (node?.isFile) {
                             this.isCommentEnabled = this.contentServices.hasPermissions(node, PermissionsEnum.NOT_CONSUMER) ||
                                 this.contentServices.hasAllowableOperations(node, AllowableOperationsEnum.UPDATE);
                             this.nodeId = id;