build: enable TSLint on the packages folder (#18459)

porting PRs #18392 and #18441 to 4.x

packages/core/test/animation/animation_integration_spec.ts

@@ -1790,7 +1790,7 @@ export function main() {
            class Cmp {
              exp: string;
              log: any[] = [];
-             callback = (event: any) => { this.log.push(`${event.phaseName} => ${event.toState}`); }
+             callback = (event: any) => this.log.push(`${event.phaseName} => ${event.toState}`);
            }
 
            TestBed.configureTestingModule({

packages/core/test/application_init_spec.ts

@@ -35,7 +35,7 @@ export function main() {
           return () => {
             const initStatus = injector.get(ApplicationInitStatus);
             initStatus.donePromise.then(() => { expect(completerResolver).toBe(true); });
-          }
+          };
         };
         promise = new Promise((res) => { resolve = res; });
         TestBed.configureTestingModule({

packages/core/test/linker/change_detection_integration_spec.ts

@@ -1353,7 +1353,7 @@ export function main() {
           tpl: TemplateRef<any>;
 
           @Input()
-          outerTpl: TemplateRef<any>
+          outerTpl: TemplateRef<any>;
 
           constructor(public cdRef: ChangeDetectorRef) {}
           log(id: string) { log.push(`inner-${id}`); }