fix: remove stale z-schema resolution, dropping unused validator dependency

[PHILLIPS71]

Description

The PR removes the outdated z-schema resolution, which in turn leaves the transitive validator dependency orphaned.

I’m not sure whether this also needs to be cherry-picked into the v0.79 and v0.80 stable branches, but the first step would be getting it fixed on main.

Type of Change

• Bug fix (non-breaking change which fixes an issue)

Why

The z-schema resolution was originally added to mitigate CVE-2021-3765 in the validator package, which was pulled in transitively via rush (a dependency of lage). lage no longer depends on rush / z-schema, making the resolution and its transitive packages orphaned in the dependency tree.

Resolves #15460, #15461

What

• removed z-schema from resolutions in package.json
• removed the accompanying resolutions.justification entry
• ran yarn to update yarn.lock, dropping problematic validator package

Screenshots

N/A

Testing

N/A

Changelog

no

Microsoft Reviewers: Open in CodeFlow

[acoates-ms]

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