fix: use correct datastore location in test environment

[ascorbic]

Changes

The content layer needs to know if it is running in dev, so that it knows whether to find the datastore in the .astro folder (so it can be watched for changes) or in node_modules (so it is cached between builds in production environments). Previously it was incorrectly detecting this in the Vite plugin by using the isProduction flag, which reports as false in a test enviornment. This PR changes it to instead use the env.command.

Fixes #12612

Testing

Docs

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Latest commit: d5e8a27

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[codspeed-hq]

CodSpeed Performance Report

Merging #12640 will degrade performances by 20.49%

_{Comparing datastore-dev (d5e8a27) with main (6b6e18d)}

Summary

❌ 1 regressions
✅ 5 untouched benchmarks

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	main	datastore-dev	Change
❌	Rendering: streaming [false], .mdx file	854.1 ms	1,074.2 ms	-20.49%