Merge config infrastructure fixes (#20771)

* ci

* fix verify-registries.js to handle deleted configs

* fix for merging tasks with multiple configs

* ci

Author: merlynomsft

BuildConfigGen/Program.cs

@@ -554,7 +554,10 @@ private static void MainUpdateTask(
                     ensureUpdateModeVerifier!.DirectoryCreateDirectory(generatedFolder, false);
                 }
 
-                foreach (var config in targetConfigs)
+                // we need to ensure merges occur first, as the changes may cascade to other configs (e.g. Default), if there are multiple
+                var targetConfigsWithMergeToBaseOrderedFirst = targetConfigs.OrderBy(x => x.mergeToBase ? 0 : 1);
+
+                foreach (var config in targetConfigsWithMergeToBaseOrderedFirst)
                 {
                     if (config.useGlobalVersion && !includeLocalPackagesBuildConfig)
                     {

BuildConfigGen/Properties/launchSettings.json

@@ -2,7 +2,7 @@
   "profiles": {
     "BuildConfigGen": {
       "commandName": "Project",
-      "commandLineArgs": "--task \"MavenV3|MavenV4\" --include-local-packages-build-config --write-updates"
+      "commandLineArgs": "--all-tasks --write-updates"
     }
   }
 }

ci/verify-registries.js

@@ -1,13 +1,14 @@
 const { run } = require('./ci-util');
 const { resolve } = require('node:path');
 const { readFileSync } = require('node:fs');
+const { existsSync } = require('fs');
 
 const cwd = process.cwd();
 const packageLocks = run(`git --no-pager diff --name-only origin/master`).split('\n').filter(x => x.endsWith('package-lock.json')).map(x => resolve(cwd, x));
 const incorrectPackageLocks = [];
 
 for (const packageLock of packageLocks) {
-    if (readFileSync(packageLock, 'utf8').indexOf('registry.npmjs.org') !== -1) {
+    if (existsSync(packageLock) && readFileSync(packageLock, 'utf8').indexOf('registry.npmjs.org') !== -1) {
         incorrectPackageLocks.push(packageLock);
     }
 }