fix(compiler): allow tree-shakeable injectables to depend on string tokens (#22376)

Previously the injectable compiler assumed all tree-shakeable injectables
would have dependencies that were injectables or InjectionTokens. However
old code still uses string tokens (e.g. NgUpgrade and '$injector'). Using
such tokens would cause the injectable compiler to crash.

Now, the injectable compiler can properly generate a dependency on such a
string token.

PR Close #22376

packages/compiler-cli/integrationtest/bazel/injectable_def/app/test/app_spec.ts

@@ -13,6 +13,7 @@ import {DepAppModuleNgFactory} from 'app_built/src/dep.ngfactory';
 import {HierarchyAppModuleNgFactory} from 'app_built/src/hierarchy.ngfactory';
 import {RootAppModuleNgFactory} from 'app_built/src/root.ngfactory';
 import {SelfAppModuleNgFactory} from 'app_built/src/self.ngfactory';
+import {StringAppModuleNgFactory} from 'app_built/src/string.ngfactory';
 import {TokenAppModuleNgFactory} from 'app_built/src/token.ngfactory';
 
 enableProdMode();
@@ -77,4 +78,14 @@ describe('ngInjectableDef Bazel Integration', () => {
       done();
     });
   });
+
+  it('string tokens work', done => {
+    renderModuleFactory(StringAppModuleNgFactory, {
+      document: '<string-app></string-app>',
+      url: '/',
+    }).then(html => {
+      expect(html).toMatch(/>works<\//);
+      done();
+    });
+  });
 });