chore: remove unnecessary lazyBarrel config

[chenjiahan]

Summary

The experiments.lazyBarrel config has been enabled by default in Rspack v1.6.0-beta.0, so it's no longer needed.

Related Links

• feat: enable lazy barrel by default rspack#11841

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR removes the explicit lazyBarrel: true configuration from Rspack experiments since this feature has been enabled by default in Rspack v1.6.0-beta.0, making the manual configuration redundant.

• Removed lazyBarrel: true from the experiments configuration in the basic plugin
• Updated test snapshots to reflect the removal of the lazyBarrel configuration

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/core/src/plugins/basic.ts	Removed the explicit lazyBarrel: true setting from Rspack experiments configuration
packages/core/tests/snapshots/basic.test.ts.snap	Updated snapshots to remove lazyBarrel from basic plugin test outputs
packages/core/tests/snapshots/builder.test.ts.snap	Updated snapshots to remove lazyBarrel from builder test outputs
packages/core/tests/snapshots/default.test.ts.snap	Updated snapshots to remove lazyBarrel from default plugin test outputs
packages/core/tests/snapshots/environments.test.ts.snap	Updated snapshots to remove lazyBarrel from environment configuration test outputs

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