fix: warn only in init command when CLI uses cached npx version (#44644)

Summary:
In #37510, a check was introduced to check if user is using `latest` version of `npx`, but right now it checks for every command executed, but it should only ensure that `latest` is included when creating a new project.

In this Pull Request I've added a condition to only warn if `init` was fired.

## Changelog:

[GENERAL] [FIXED] - Warn only in `init` command when CLI uses cached `npx` version

Pull Request resolved: #44644

Test Plan: Warning about using `latest` version CLI should only be presented when running `init` command.

Reviewed By: arushikesarwani94

Differential Revision: D57681864

Pulled By: blakef

fbshipit-source-id: 5c81b9a08141396efcd24539b2560cea16028dd9

Author: szymonrybczak

packages/react-native/cli.js

@@ -29,6 +29,7 @@ let cli = {
 };
 
 const isNpxRuntime = process.env.npm_lifecycle_event === 'npx';
+const isInitCommand = process.argv[2] === 'init';
 const DEFAULT_REGISTRY_HOST =
   process.env.npm_config_registry ?? 'https://registry.npmjs.org/';
 const HEAD = '1000.0.0';
@@ -65,7 +66,7 @@ async function getLatestVersion(registryHost = DEFAULT_REGISTRY_HOST) {
  * @see https://github.com/react-native-community/discussions-and-proposals/tree/main/proposals/0759-react-native-frameworks.md
  */
 function warnWhenRunningInit() {
-  if (process.argv[2] === 'init') {
+  if (isInitCommand) {
     console.warn(
       `\nRunning: ${chalk.grey.bold('npx @react-native-community/cli init')}\n`,
     );
@@ -80,7 +81,7 @@ function warnWhenRunningInit() {
  * @see https://github.com/react-native-community/discussions-and-proposals/tree/main/proposals/0759-react-native-frameworks.md
  */
 function warnWithDeprecationSchedule() {
-  if (process.argv[2] !== 'init') {
+  if (!isInitCommand) {
     return;
   }
 
@@ -127,7 +128,12 @@ ${chalk.yellow('⚠')}️ The \`init\` command is deprecated.
  *
  */
 async function main() {
-  if (isNpxRuntime && !process.env.SKIP && currentVersion !== HEAD) {
+  if (
+    isNpxRuntime &&
+    !process.env.SKIP &&
+    currentVersion !== HEAD &&
+    isInitCommand
+  ) {
     try {
       const latest = await getLatestVersion();
       // TODO: T184416093 When cli is deprecated, remove semver from package.json