feat[react-gen2]: support for variant containers

[sidmohanty11]

Description

Adds support for Variant Containers on Gen2 React SDK

Jira
https://builder-io.atlassian.net/browse/ENG-7676

Screenshot
If relevant, add a screenshot or two of the changes you made.

[changeset-bot]

🦋 Changeset detected

Latest commit: 90620c7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 9 packages

Name	Type
@builder.io/sdk-solid	Patch
@builder.io/sdk-svelte	Patch
@builder.io/sdk-vue	Patch
@builder.io/sdk-angular	Patch
@builder.io/sdk-react-native	Patch
@builder.io/sdk-qwik	Patch
@builder.io/sdk-react	Patch
@builder.io/sdk-react-nextjs	Patch
@builder.io/react	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 90620c7.

Command	Status	Duration	Result
nx test @e2e/qwik-city	✅ Succeeded	9m 13s	View ↗
nx test @e2e/nextjs-sdk-next-app	✅ Succeeded	8m 26s	View ↗
nx test @e2e/nuxt	✅ Succeeded	8m	View ↗
nx test @e2e/svelte	✅ Succeeded	6m 55s	View ↗
nx test @e2e/hydrogen	✅ Succeeded	6m 56s	View ↗
nx test @e2e/react-sdk-next-14-app	✅ Succeeded	6m 35s	View ↗
nx test @e2e/angular-16-ssr	✅ Succeeded	6m 47s	View ↗
nx test @e2e/react-sdk-next-pages	✅ Succeeded	6m 31s	View ↗
Additional runs (35)	✅ Succeeded	...	View ↗

---

☁️ Nx Cloud last updated this comment at 2025-01-31 08:50:13 UTC

[samijaber]

Another bug I found: styles (probably other root-level attributes too) not applying to root VariantContainer itself: https://www.loom.com/share/8576990685a7420f8fa33cfbac9a6ce2

[sidmohanty11]

@samijaber thanks for the catch again! it was for styles only, the block didn't have the builder-id in the classname so it wasn't getting applied. Have fixed this and added a test for this