fix(@schematics/angular): generate main.ts with lint-compatible error handling

Use unknown catch callback parameters and block bodies in standalone and NgModule
application templates. Cover both variants in application schematic tests.

Closes #34267

Author: Hangell

packages/schematics/angular/application/files/module-files/src/main.ts.template

@@ -5,4 +5,6 @@ import { AppModule } from './app/app<%= typeSeparator %>module';
 platformBrowser().bootstrapModule(AppModule, {
   <% if (!!viewEncapsulation) { %> defaultEncapsulation: ViewEncapsulation.<%= viewEncapsulation %><% } %>
 })
-  .catch(err => console.error(err));
+  .catch((err: unknown) => {
+    console.error(err);
+  });

packages/schematics/angular/application/files/standalone-files/src/main.ts.template

@@ -3,4 +3,6 @@ import { appConfig } from './app/app.config';
 import { App } from './app/app<%= suffix %>';
 
 bootstrapApplication(App, appConfig)
-  .catch((err) => console.error(err));
+  .catch((err: unknown) => {
+    console.error(err);
+  });

packages/schematics/angular/application/index_spec.ts

@@ -696,13 +696,16 @@ describe('Application Schematic', () => {
     expect(config).toContain('provideRouter(routes)');
   });
 
-  it('should create a main.ts', async () => {
-    const options = { ...defaultOptions, standalone: true };
-    const tree = await schematicRunner.runSchematic('application', options, workspaceTree);
+  for (const standalone of [true, false]) {
+    it(`should create a main.ts with an unknown catch parameter and a block body (standalone=${standalone})`, async () => {
+      const options = { ...defaultOptions, standalone };
+      const tree = await schematicRunner.runSchematic('application', options, workspaceTree);
 
-    const main = tree.readContent('/projects/foo/src/main.ts');
-    expect(main).toContain('bootstrapApplication');
-  });
+      const main = tree.readContent('/projects/foo/src/main.ts');
+      expect(main).toContain(standalone ? 'bootstrapApplication' : 'bootstrapModule');
+      expect(main).toMatch(/\.catch\(\(err: unknown\) => \{\s+console\.error\(err\);\s+\}\);/);
+    });
+  }
 
   describe('standalone=false', () => {
     it('should add the provideZoneChangeDetection with event coalescing option by default with zone.js apps', async () => {