message: fix(ngcc): add reexports only once
  When ngcc is configured to generate reexports for a package using the
  `generateDeepReexports` configuration option, it could incorrectly
  render the reexports as often as the number of compiled classes in the
  declaration file. This would cause compilation errors due to duplicated
  declarations.
  PR Close
diff: @@ -96,14 +96,14 @@ export class DtsRenderer {
  const newStatement = ` static ${declaration.name}: ${typeStr};\n`;
  outputText.appendRight(endOfClass - 1, newStatement);
  });
  + });
  if (renderInfo.reexports.length > 0) {
  for (const e of renderInfo.reexports) {
  const newStatement = `\nexport {${e.symbolName} as ${e.asAlias}} from '${e.fromModule}';`;
  - outputText.appendRight(endOfClass, newStatement);
  + outputText.append(newStatement);
  }
  }
  - });
  this.dtsFormatter.addModuleWithProvidersParams(
  outputText, renderInfo.moduleWithProviders, importManager);
  