build: remove references to tsc-wrapped (#19298)

With this commit `ngc` is used instead of `tsc-wrapped` for
collecting metadata and tsickle rewriting and `tsc-wrapped`
is removed from the repository.

`@angular/tsc-wrapped@5` is now deprecated and is no longer
used, updated, or maintained as part as of Angular 5.x.x.

`@angular/tsc-wrapped@4` is still maintained and required by
Angular 4.x.x and will be maintained as long as 4.x.x is in
LTS.

PR Close #19298

packages/compiler-cli/src/transformers/compiler_host.ts

@@ -431,6 +431,10 @@ function addReferencesToSourceFile(sf: ts.SourceFile, genFileNames: string[]) {
   sf.referencedFiles = newReferencedFiles;
 }
 
+export function getOriginalReferences(sourceFile: ts.SourceFile): ts.FileReference[]|undefined {
+  return sourceFile && (sourceFile as any).originalReferencedFiles;
+}
+
 function dotRelative(from: string, to: string): string {
   const rPath: string = path.relative(from, to).replace(/\\/g, '/');
   return rPath.startsWith('.') ? rPath : './' + rPath;