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/cloud/cloud-filters-demo.component.ts

@@ -53,7 +53,7 @@ export class CloudFiltersDemoComponent implements OnInit {
         this.currentProcessFilter$ = this.cloudLayoutService.processFilter$;
 
         let root = '';
-        if (this.route.snapshot && this.route.snapshot.firstChild) {
+        if (this.route.snapshot?.firstChild) {
             root = this.route.snapshot.firstChild.url[0].path;
             if (root === 'tasks') {
                 this.expandTaskFilter = true;

demo-shell/src/app/components/cloud/cloud-layout.component.ts

@@ -41,7 +41,7 @@ export class CloudLayoutComponent implements OnInit {
             this.appName = params.appName;
         });
 
-        if (this.route.snapshot && this.route.snapshot.firstChild) {
+        if (this.route.snapshot?.firstChild) {
             root = this.route.snapshot.firstChild.url[0].path;
         }
 

demo-shell/src/app/components/cloud/processes-cloud-demo.component.ts

@@ -185,7 +185,7 @@ export class ProcessesCloudDemoComponent implements OnInit, OnDestroy {
     }
 
     private loadFilter(model: ProcessFilterCloudModel) {
-        if (model && model.appName && model.id) {
+        if (model?.appName && model.id) {
             this.editedFilter = model;
         }
     }