fix(ng-dev): remove unused yarn update misc command

`pnpm` is now used across the supported repos which makes the yarn update command unused and can be removed.

Author: clydin

ng-dev/misc/cli.ts

@@ -8,7 +8,6 @@
 import {Argv} from 'yargs';
 
 import {BuildAndLinkCommandModule} from './build-and-link/cli.js';
-import {UpdateYarnCommandModule} from './update-yarn/cli.js';
 import {GeneratedFilesModule} from './generated-files/cli.js';
 import {GeneratedNodeJsToolchainModule} from './generate-nodejs-toolchain/cli.js';
 
@@ -18,7 +17,6 @@ export function buildMiscParser(localYargs: Argv) {
     .help()
     .strict()
     .command(BuildAndLinkCommandModule)
-    .command(UpdateYarnCommandModule)
     .command(GeneratedFilesModule)
     .command(GeneratedNodeJsToolchainModule);
 }