refactor(ivy): ngcc - remove the targetPath properties of Transformer and Renderer (#29556)

We have already removed this concept from the public API. This just cleans it out altogether.

The `targetPath` was an alternative output path to the original `basePath`.
This is not really a very useful concept, since the actual target path
of each output file is more complex and not consistently relative to the `basePath`.

PR Close #29556

packages/compiler-cli/ngcc/test/rendering/renderer_spec.ts

@@ -21,7 +21,7 @@ import {makeTestEntryPointBundle} from '../helpers/utils';
 
 class TestRenderer extends Renderer {
   constructor(host: Esm2015ReflectionHost, isCore: boolean, bundle: EntryPointBundle) {
-    super(host, isCore, bundle, '/src', '/dist');
+    super(host, isCore, bundle, '/src');
   }
   addImports(output: MagicString, imports: {specifier: string, qualifier: string}[]) {
     output.prepend('\n// ADD IMPORTS\n');