fix(ivy): properly rewrite imports in generated factory shims (#27998)

Generated factory shims can import from @angular/core. However, we have
special logic in place to rewrite self-imports when generating code for
@angular/core.

This commit leverages the new standalone ImportRewriter interface to
properly rewrite imports in generated factory shims. Before this fix,
a generated factory file for core would look like:

```typescript
import * as i0 from './r3_symbols';

export var ApplicationModuleNgFactory = new ɵNgModuleFactory(...);
```

This is invalid, as ɵNgModuleFactory is just NgModuleFactory when imported
via r3_symbols.

FW-881 #resolve

PR Close #27998

packages/compiler-cli/src/ngtsc/program.ts

@@ -239,7 +239,7 @@ export class NgtscProgram implements api.Program {
 
     if (this.factoryToSourceInfo !== null) {
       beforeTransforms.push(
-          generatedFactoryTransform(this.factoryToSourceInfo, this.coreImportsFrom));
+          generatedFactoryTransform(this.factoryToSourceInfo, this.importRewriter));
     }
     if (this.isCore) {
       beforeTransforms.push(ivySwitchTransform);