refactor(dev-infra): move existing env-stamp command into subfolder (#38656)

Moves the existing `ng-dev release env-stamp` command into a
subfolder so that the staging/publish tool can have its own
dedicated folder (without being polluted by the env-stamp logic).

Every subcommand should be in its own folder.

PR Close #38656

dev-infra/release/BUILD.bazel

@@ -3,16 +3,13 @@ load("@npm_bazel_typescript//:index.bzl", "ts_library")
 ts_library(
     name = "release",
     srcs = glob([
-        "*.ts",
+        "**/*.ts",
     ]),
     module_name = "@angular/dev-infra-private/release",
     visibility = ["//dev-infra:__subpackages__"],
     deps = [
         "//dev-infra/utils",
-        "@npm//@types/node",
-        "@npm//@types/shelljs",
         "@npm//@types/yargs",
-        "@npm//shelljs",
         "@npm//yargs",
     ],
 )

dev-infra/release/cli.ts

@@ -6,12 +6,17 @@
  * found in the LICENSE file at https://angular.io/license
  */
 import * as yargs from 'yargs';
-import {buildEnvStamp} from './env-stamp';
+
+import {buildEnvStamp} from './stamping/env-stamp';
 
 /** Build the parser for the release commands. */
 export function buildReleaseParser(localYargs: yargs.Argv) {
-  return localYargs.help().strict().demandCommand().command(
-      'build-env-stamp', 'Build the environment stamping information', {}, () => buildEnvStamp());
+  return localYargs.help()
+      .strict()
+      .demandCommand()
+      .command(
+          'build-env-stamp', 'Build the environment stamping information', {},
+          () => buildEnvStamp());
 }
 
 if (require.main === module) {

dev-infra/release/stamping/env-stamp.ts

@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {exec as _exec} from '../utils/shelljs';
+import {exec as _exec} from '../../utils/shelljs';
 
 /**
  * Log the environment variables expected by bazel for stamping.