refactor(core): wire up missing-injectable migration for ng-update (#32349)

Initially the `missing-injectable` migration was only being used
in google3. Wiring the migration up in the CLI migrations was
planned to be done in a follow-up.

PR Close #32349

packages/core/schematics/test/BUILD.bazel

@@ -5,7 +5,6 @@ ts_library(
     testonly = True,
     srcs = glob(["**/*.ts"]),
     data = [
-        "test-migrations.json",
         "//packages/core/schematics:migrations.json",
     ],
     deps = [

packages/core/schematics/test/missing_injectable_migration_spec.ts

@@ -21,7 +21,7 @@ describe('Missing injectable migration', () => {
   let warnOutput: string[];
 
   beforeEach(() => {
-    runner = new SchematicTestRunner('test', require.resolve('./test-migrations.json'));
+    runner = new SchematicTestRunner('test', require.resolve('../migrations.json'));
     host = new TempScopedNodeJsSyncHost();
     tree = new UnitTestTree(new HostTree(host));
 
@@ -61,7 +61,7 @@ describe('Missing injectable migration', () => {
   }
 
   async function runMigration() {
-    await runner.runSchematicAsync('migration-missing-injectable', {}, tree).toPromise();
+    await runner.runSchematicAsync('migration-v9-missing-injectable', {}, tree).toPromise();
   }
 
   it('should migrate type provider in NgModule', async() => {

packages/core/schematics/test/test-migrations.json

@@ -1,10 +0,0 @@
-{
-  // Migrations which are not publicly enabled but still run as part of tests need to
-  // be part of a schematic collection in order to be able to run it.
-  "schematics": {
-    "migration-missing-injectable": {
-      "description": "Migrates all declared undecorated providers with the @Injectable decorator",
-      "factory": "../migrations/missing-injectable/index"
-    }
-  }
-}