Strip sourcemap reference from dev toolbar entrypoint

[matthewp]

Changes

• This removes the frequent 404 caused by the browser loading a sourcemap that doesn't exist.
• esbuild creates the sourcemap link, we remove it from the file when its optimized.

Testing

• Verified manually: the spurious .js.map request no longer appears in dev server logs after opening a page in the browser.

Docs

• No docs update needed.

[changeset-bot]

🦋 Changeset detected

Latest commit: ae6b48e

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

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[codspeed-hq]

Merging this PR will not alter performance

✅ 18 untouched benchmarks

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_{Comparing strip-toolbar-sourcemap (ae6b48e) with main (1058428)}