Enable Theme Access passwords for theme serve

[gonzaloriestra]

WHY are these changes introduced?

Related to https://github.com/Shopify/shopify-cli-planning/issues/376

WHAT is this pull request doing?

Proxies Storefront Renderer requests from the dev server through Theme Access API when a password is provided

How to test your changes?

Once https://github.com/Shopify/theme-access/pull/2463 and https://github.com/Shopify/storefront-renderer/pull/15845 are released, it can be tested with: SHOPIFY_SHOP=your-shop SHOPIFY_CLI_ADMIN_AUTH_TOKEN=password SHOPIFY_CLI_STOREFRONT_RENDERER_AUTH_TOKEN=password shopify theme serve

Otherwise, it requires updating the Theme Access URL to local/staging and hard-coding an access token for SFR here.

Update checklist

• I've added a CHANGELOG entry for this PR (if the change is public-facing)
• I've considered possible cross-platform impacts (Mac, Linux, Windows).
• I've left the version number as is (we'll handle incrementing this when releasing).
• I've included any post-release steps in the section above (if needed).

[mgmanzella]

nice! 🔥 left one question

[mgmanzella]

🚀

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