fix(worker): disable build reporter plugin when bundling worker

[sapphi-red]

Description

When running pnpm build in playground/worker, the log was like:

vite v4.0.0-alpha.5 building for production...
✓ 1 modules transformed.
✓ 2 modules transformed.
✓ 3 modules transformed.
✓ 4 modules transformed.
✓ 5 modules transformed.
✓ 7 modules transformed.
✓ 11 modules transformed.
✓ 12 modules transformed.
✓ 17 modules transformed.
✓ 18 modules transformed.
✓ 25 modules transformed.
✓ 32 modules transformed.
✓ 33 modules transformed.
✓ 34 modules transformed.
✓ 16 modules transformed.

This PR fixes this output to be:

vite v4.0.0-alpha.5 building for production...
✓ 16 modules transformed.

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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• Read the Contributing Guidelines.
• Read the Pull Request Guidelines and follow the Commit Convention.
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• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.