fix(react-compiler-healthcheck): Add shebang to banner

[Jeremy-Hibiki]

Summary

PR #31963 migrated the bundler from Rollup to esbuild, but the react-compiler-healthcheck script lacks a shebang, leading to issues with npx not being able to execute it.

react/compiler/packages/react-compiler-healthcheck/rollup.config.js

Lines 60 to 78 in dc75782

	banner2(
	() => `#!/usr/bin/env node
	/**
	* Copyright (c) Meta Platforms, Inc. and affiliates.
	*
	* This source code is licensed under the MIT license found in the
	* LICENSE file in the root directory of this source tree.
	*
	* @lightSyntaxTransform
	* @noflow
	* @nolint
	* @preventMunge
	* @preserve-invariant-messages
	*/
	"use no memo";
	`
	),

react/compiler/packages/react-compiler-healthcheck/scripts/build.js

Lines 38 to 53 in 9eabb37

	banner: {
	js: `/**
	* Copyright (c) Meta Platforms, Inc. and affiliates.
	*
	* This source code is licensed under the MIT license found in the
	* LICENSE file in the root directory of this source tree.
	*
	* @lightSyntaxTransform
	* @noflow
	* @nolint
	* @preventMunge
	* @preserve-invariant-messages
	*/
	"use no memo";`,
	},

How did you test this change?

Before

(fail)

(main)> npx --version
10.5.0
(main)> npx react-compiler-healthcheck
/home/jeremy/.npm/_npx/67b118a83a29962c/node_modules/.bin/react-compiler-healthcheck: line 1: /bin: Is a directory
/home/jeremy/.npm/_npx/67b118a83a29962c/node_modules/.bin/react-compiler-healthcheck: line 2: syntax error near unexpected token `('
/home/jeremy/.npm/_npx/67b118a83a29962c/node_modules/.bin/react-compiler-healthcheck: line 2: ` * Copyright (c) Meta Platforms, Inc. and affiliates.'

After

(main)> npx react-compiler-healthcheck
Successfully compiled 108 out of 146 components.
StrictMode usage not found.
Found no usage of incompatible libraries.

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