🏗 Temporarily disable Storybook AMP environment (#36780)

`@ampproject/storybook-addon` has outdated peer dependencies that conflict with the main install. Disable the AMP environment for now so that the Preact environment can run.

We'll update the addon soon: ampproject/storybook-addon-amp#57

Additionally, we were relying on `@storybook/client-api` as a transitive dependency from the addon. Install it so that Storybook can run.

build-system/tasks/storybook/index.js

@@ -11,6 +11,7 @@ const {isCiBuild} = require('../../common/ci');
 const {isPullRequestBuild} = require('../../common/ci');
 const {log} = require('../../common/logging');
 const {writeFileSync} = require('fs-extra');
+const {yellow} = require('kleur/colors');
 
 const ENV_PORTS = {
   amp: 9001,
@@ -29,6 +30,13 @@ const envConfigDir = (env) => path.join(__dirname, `${env}-env`);
  * @param {string} env 'amp' or 'preact'
  */
 function launchEnv(env) {
+  if (env === 'amp') {
+    log(
+      yellow('AMP environment for storybook is temporarily disabled.\n') +
+        'See https://github.com/ampproject/storybook-addon-amp/issues/57'
+    );
+    return;
+  }
   log(`Launching storybook for the ${cyan(env)} environment...`);
   const {'storybook_port': port = ENV_PORTS[env]} = argv;
   execScriptAsync(
@@ -50,6 +58,14 @@ function launchEnv(env) {
  * @param {string} env 'amp' or 'preact'
  */
 function buildEnv(env) {
+  if (env === 'amp') {
+    log(
+      yellow('AMP environment for storybook is temporarily disabled.\n') +
+        'See https://github.com/ampproject/storybook-addon-amp/issues/57'
+    );
+    return;
+  }
+
   const configDir = envConfigDir(env);
 
   if (env === 'amp' && isPullRequestBuild()) {