refactor(compiler-cli): remove a test that we no longer care about (#25649)

Alex R. says that we no longer care about the behavior this is testing.

PR Close #25649

packages/compiler-cli/test/ngc_spec.ts

@@ -2364,36 +2364,6 @@ describe('ngc transformer command-line', () => {
               'Module.ngInjectorDef = i0.defineInjector({ factory: function Module_Factory() { return new Module(); }, providers: ɵ1, imports: [ɵ2, ɵ3] });');
     });
 
-    it('strips decorator in ivy mode', () => {
-      writeConfig(`{
-        "extends": "./tsconfig-base.json",
-        "files": ["service.ts"],
-        "angularCompilerOptions": {
-          "enableIvy": true
-        }
-      }`);
-      write('service.ts', `
-        import {Injectable, Self} from '@angular/core';  
-
-        @Injectable()
-        export class ServiceA {}
-
-        @Injectable()
-        @Self()
-        export class ServiceB {}
-      `);
-
-      const exitCode = main(['-p', path.join(basePath, 'tsconfig.json')], errorSpy);
-      expect(exitCode).toEqual(0);
-
-      const modulePath = path.resolve(outDir, 'service.js');
-      const moduleSource = fs.readFileSync(modulePath, 'utf8');
-      expect(moduleSource).not.toMatch(/ServiceA\.decorators =/);
-      expect(moduleSource).toMatch(/ServiceB\.decorators =/);
-      expect(moduleSource).toMatch(/type: Self/);
-      expect(moduleSource).not.toMatch(/type: Injectable/);
-    });
-
     it('rewrites Injector to INJECTOR in Ivy factory functions ', () => {
       writeConfig(`{
         "extends": "./tsconfig-base.json",