fix(ivy): Support selector-less directive as base classes (#32125)

Following #31379, this adds support for directives without a selector to
Ivy.

PR Close #32125

packages/core/testing/src/r3_test_bed_compiler.ts

@@ -299,7 +299,7 @@ export class R3TestBedCompiler {
     this.pendingComponents.clear();
 
     this.pendingDirectives.forEach(declaration => {
-      const metadata = this.resolvers.directive.resolve(declaration) !;
+      const metadata = this.resolvers.directive.resolve(declaration);
       this.maybeStoreNgDef(NG_DIRECTIVE_DEF, declaration);
       compileDirective(declaration, metadata);
     });