fix(@angular/build): avoid hashing development external component stylesheets

When using the development server with a production configuration or with bundle
hashing enabled, the external stylesheet files used by the development server for
hot replacement of component styles are no longer hashed. This ensures that the
requests from the runtime served by the development server match the available
generated component stylesheet files.

(cherry picked from commit 31f9037)

Author: clydin

packages/angular/build/src/tools/esbuild/angular/component-stylesheets.ts

@@ -48,6 +48,7 @@ export class ComponentStylesheetBundler {
           );
 
           buildOptions.entryPoints = { [externalId]: entry };
+          buildOptions.entryNames = '[name]';
           delete buildOptions.publicPath;
         } else {
           buildOptions.entryPoints = [entry];
@@ -88,6 +89,7 @@ export class ComponentStylesheetBundler {
         });
         if (externalId) {
           buildOptions.entryPoints = { [externalId]: `${namespace};${entry}` };
+          buildOptions.entryNames = '[name]';
           delete buildOptions.publicPath;
         } else {
           buildOptions.entryPoints = [`${namespace};${entry}`];