Create new CLI init-windows command (#12123)

* Create new CLI init-windows command

## Description

This PR implements a new, named template-based `react-native
init-windows` command as described by #11920.

Note, this does not change or deprecate the existing
`react-native-windows-init` / `generateWindows` infrastructure or
templates.

### Type of Change
- New feature (non-breaking change which adds functionality)

### Why

This is part of restructuring how users can add RNW support to their RN
projects.

### What

1. Creates a new `init-windows` RN CLI command that creates a new
   windows project based on a given template
2. The first CLI templates under `old/`, which are just wrappers which
   call the existing templating code in `generateWindows`

Closes #12152
Closes #12151
Closes #12150
Closes #12149
Closes #12148
Closes #12147

## Screenshots
N/A

## Testing
Ran existing tests, created base `initWindows` tests.

## Changelog
Should this change be included in the release notes: yes

Created a new `init-windows` command

* fix generateWrapper

* remove sample apps package.json

* update yarn.lock

* Rename old templates

.github/CODEOWNERS

@@ -52,6 +52,7 @@
 
 # CLI for the new project templates
 /vnext/template/**  @microsoft/react-native-windows-cli @microsoft/react-native-windows-write
+/vnext/templates/**  @microsoft/react-native-windows-cli @microsoft/react-native-windows-write
 
 # Ownership by specific files or file types
 # This section MUST stay at the bottom of the CODEOWNERS file.

change/@react-native-windows-cli-a63260e2-235e-4bff-89ed-3b03dd6a6c6d.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Create new CLI init-windows command",
+  "packageName": "@react-native-windows/cli",
+  "email": "jthysell@microsoft.com",
+  "dependentChangeType": "patch"
+}

change/@react-native-windows-telemetry-fcb890af-66a4-4e17-99ab-3845d6675bd6.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Create new CLI init-windows command",
+  "packageName": "@react-native-windows/telemetry",
+  "email": "jthysell@microsoft.com",
+  "dependentChangeType": "patch"
+}

change/react-native-windows-97a9b3b1-baef-4331-b3d6-f805e8d2d323.json

@@ -0,0 +1,7 @@
+{
+  "type": "prerelease",
+  "comment": "Create new CLI init-windows command",
+  "packageName": "react-native-windows",
+  "email": "jthysell@microsoft.com",
+  "dependentChangeType": "patch"
+}

packages/@react-native-windows/cli/depcheck.config.js

@@ -2,6 +2,7 @@ module.exports = {
   // Resolved dynamically from user project
   ignoreMatches: [
     '@react-native-community/cli',
+    '@react-native-windows/cli',
     'execa',
     'react-native',
     'react-native-windows'

packages/@react-native-windows/cli/src/commands/autolinkWindows/autolinkWindows.ts

@@ -33,6 +33,7 @@ import {
 import * as vstools from '../../utils/vstools';
 import * as generatorCommon from '../../generator-common';
 import * as configUtils from '../config/configUtils';
+import * as pathHelpers from '../../utils/pathHelpers';
 import {
   getDefaultOptions,
   startTelemetrySession,
@@ -853,12 +854,7 @@ export class AutoLinkWindows {
  * @param config project configuration
  */
 function resolveRnwRoot(projectConfig: WindowsProjectConfig) {
-  const rnwPackage = path.dirname(
-    require.resolve('react-native-windows/package.json', {
-      paths: [projectConfig.folder],
-    }),
-  );
-  return rnwPackage;
+  return pathHelpers.resolveRnwRoot(projectConfig.folder);
 }
 
 /**
@@ -1016,7 +1012,7 @@ export async function autolinkWindowsInternal(
  */
 export const autolinkCommand: Command = {
   name: 'autolink-windows',
-  description: 'performs autolinking',
+  description: 'Runs Windows-specific autolinking',
   func: autolinkWindows,
   options: autolinkOptions,
 };

packages/@react-native-windows/cli/src/commands/codegenWindows/codegenWindows.ts

@@ -315,7 +315,7 @@ export async function codegenWindowsInternal(
  */
 export const codegenCommand: Command = {
   name: 'codegen-windows',
-  description: 'Runs Windows specific codegen',
+  description: 'Runs Windows-specific codegen',
   func: codegenWindows,
   options: codegenOptions,
 };

packages/@react-native-windows/cli/src/commands/healthCheck/healthChecks.ts

@@ -6,12 +6,11 @@
 
 import path from 'path';
 
-const rnDir = path.dirname(
-  require.resolve('react-native/package.json', {paths: [process.cwd()]}),
-);
-const cliDir = path.dirname(
-  require.resolve('@react-native-community/cli/package.json', {paths: [rnDir]}),
-);
+import * as pathHelpers from '../../utils/pathHelpers';
+
+const rnDir = pathHelpers.resolveRnRoot(process.cwd());
+const cliDir = pathHelpers.resolveRnCliRoot(rnDir);
+
 const execaPath = require.resolve('execa', {paths: [cliDir]});
 const execa = require(execaPath);
 
@@ -53,11 +52,7 @@ function getHealthChecksUnsafe(): HealthCheckCategory[] | undefined {
   }
 
   const rnwDepScriptPath = path.join(
-    path.dirname(
-      require.resolve('react-native-windows/package.json', {
-        paths: [process.cwd()],
-      }),
-    ),
+    pathHelpers.resolveRnwRoot(process.cwd()),
     'Scripts/rnw-dependencies.ps1',
   );