feat(pack): set invalid export checker from error to warning

[fireairforce]

Summary

for issue: #2323

把这个检查先从 error 调整到 warning 了，参考 webpack 的配置: https://webpack.js.org/configuration/module/#moduleparserjavascriptimportexportspresence

Test Plan

参考快照测试里面的日志输出。

[gemini-code-assist]

Summary of Changes

Hello @fireairforce, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request adjusts the build process to treat invalid export declarations as warnings rather than errors. This change aims to improve the developer experience by allowing builds to complete with non-blocking notifications for potential issues, rather than failing outright. It also includes necessary updates to snapshot tests to reflect this change in diagnostic output and an update to the next.js subproject.

Highlights

• Invalid Export Checker Severity: The severity of the invalid export checker has been downgraded from an error to a warning, aligning with common practices in bundlers like Webpack.
• Snapshot Test Updates: Snapshot test files related to typescript/interface_export have been updated to reflect the change in severity from error to warning for invalid exports.
• CSS Snapshot Update: A CSS snapshot test file has been updated to change a color value from #000 to #000000d9.
• next.js Subproject Update: The next.js subproject has been updated to a newer commit (ea4e1a9d36dd2fcd5839abdcdfa883182e1816f1).

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[gemini-code-assist]

Code Review

本次 PR 的核心改动是将无效导出的检查从 error 调整为 warning，此举参考了 Webpack 的相关配置，使行为保持一致。相关的快照测试也已同步更新，正确反映了这一变化。另外，CSS 快照测试中 color 值的变化（从 #000 到 #000000d9）是正确的，它修正了之前未能正确处理颜色透明度的问题，这很可能是由于 next.js 子模块更新带来的一个积极改进。整体而言，本次提交的修改是正确且合理的，没有发现问题。

[xusd320]

在 #2360 一起更新了