chore(build): remove content pipeline check

[Dawn6666666]

Type of change

• Bug fix (a non-breaking change that fixes an issue)
• New feature (a non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please describe):

Checklist

• I have read the CONTRIBUTING document.
• I have checked to ensure that this Pull Request is not for personal changes.
• I have performed a self-review of my own code.
• My changes generate no new warnings.

Related Issue

None.

Changes

Remove node scripts/check-content-pipeline.mjs from the production build command. This prevents content-separated builds from failing when the upstream content-pipeline fixture is not present in the personal content repository.

The checker script and its tests are left unchanged; only its automatic build invocation is removed.

How To Test

Not run, as requested.

Screenshots (if applicable)

Not applicable.

Additional Notes

This PR changes only package.json.

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